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196

Analysis of the Species

1. Hyalotheca
  Fragile; joints bicrenate dissiliens.
Scarcely fragile; joints with a minute bifid projection mucosa.
2. Didymoprium
  Joints broader than long; with angular teeth Grevillii.
Joints longer than broad ; with rounded crenatures Borreri.
3. Desmidium
  Filament triangular Swartzii.
Filament quadrangular quadrangulatum.
4. Aptogonum
      Desmidium.
5. Sphaerozosma
  Constriction ,of joints a linear notch on each margin vertebratum
Constriction a broad sinus on each margin excavatum
6. Micrasterias
1. Lobes of segments radiate, incised and cuneate 2
Lobes horizontal, tapering and bidentate 12
2. Frond orbicular or oblong. lobes and subdivisions approximate 3
Frond subelliptic; end lobe exserted 10
3. Frond oblong Jenneri
Frond orbicular 4
4. End lobes broadest 5
End lobes narrow 6
5. End margin convex crenata
End margin truncate or concave truncata
6. Principal divisions of the frond bordered with puncta-like granules papillifera
Surface of frond smooth 7
7. Ultimate subdivision of lateral lobes inflated and tapering radiosa
Ultimate subdivisions truncate 8
8. Extremities of subdivisions neither spinous nor mucronate denticulata
Extremities of subdivisions either spinous or mucronate 9
9. Extremities of subdivisions abrupt with acute or spinous angles rotata
Extremities of subdivisions rounded and furnished with two mucros fimbriata
10. Angles of end lobe bipartite ; lateral lobes toothed americana
Angles of end lobe bidentate; lateral lobes deeply divided 11
11. Subdivisions of lobes long, narrow-linear furcata
Subdivisions of lobes short, scarcely linear Crux-Melitensis
12. End margin convex; lobes conical oscitans
End margin straight; lobes triangular pinnatifida
7. Euastrum
1. Terminal lobe distinct, cuneate, included in a notch formed by the lateral lobes 2
Terminal lobe exserted or indistinct 4
2. Frond rough; end margin sinuated verrucosum
Frond smooth; terminal notch linear 3
3. Segments 5-lobed oblongum
Segments 3-lobed crassum
4. Segments with a distinct, narrow, terminal notch 5
Segments with the end margin straight or slightly concave 15
5. Ends protuberant or pouting; angles usually terminated by a spine 6
End straight or convex 7
6. End projections angular and tooth-like rostratum
End projections pouting and rounded elegans
7. End lobe distinct, dilated, and connected to the basal portion by a distinct neck. 8
End lobe obscure, not dilated 12
8. Transverse view with straight or concave sides; neck very long insigne
Transverse view with inflated or lobed middle 9
9. Segments distinctly 5-lobed pinnatum
Segments not 5-lobed 10
10. Neck of segments included between the process-like elongations of middle lobes humerosum
Neck exserted 11
11. Segments inflated at the base ampullaceum
Segments pyramidal, not inflated affine
12. End margin truncate, with acute angles binale
Ends rounded 13
13. Segments cuneiform, not lobed cuneatum
Segments either lobed or contracted upwards into a neck (not cuneiform) 14
14. Transverse view with one protuberance on each side ansatum
Transverse view with three protuberances on each side circulare
Transverse view with four protuberances on each side Didelta
15. End lobe distinct, dilated and joined to the basal portion by a neck 16
Margins sinuated but not lobed sublobatum
16. Protuberances smooth; end margin straight pectinatum
Protuberauces granulated; end margin concave gemmatum
8. Cosmarium
1. Constriction forming a linear notch on each side. end view not circular 2
Constriction not forming notches at the sides ; end view circular 24
2. Segments smooth, entire 3
Segments crenate or margined by pearly granules 9
3. Frond lenticular Ralfsii
Frond not lenticular 4
4. Frond as broad as or broader than long 5
Frond longer than broad 7
5. Segments reniform; end view with a slight lobe on each side at the middle Phaseolus
Segments elliptic in both front and end views 6
6. Empty frond reddish; notches closed tinctum
Empty frond hyaline; notches gaping bioculatum
7. Ends rounded Cucumis
Ends truncate 8
8. Segments quadrate quadratum
Segments oval with flattened ends pyramidatum
Segments truncato-triangular granatum
9. End view elliptic 10
End view with a lobe at the middle of each side 19
10. Frond smooth, crenate 11
Frond rough with pearly granules which give a denticulate appearance to the margin 13
11. Sides and end of segments bicrenate Meneghinii
Segments with many crenatures 12
12. Segments with flattened, minutely crenate ends; spines of sporangium very short crenatum
Segments with rounded, strongly crenate ends; spines of sporangium elongated undulatum
13. Segments truncato-triangular Botrytis
Segments not in the least triangular 14
14. Frond elliptic; granules large and confined to the margin. ovale
Frond not elliptic ; granules not confined to the margin15
15. Frond twice as long as broad, with parallel sides amoenum
Frond not twice as long as broad ; sides not parallel 16
16. Segments quadrangular conspersum
Segments rounded 17
17. Pearly granules longer than broad Brebissonii
Pearly granules broader than long 18
18. Granules giving a crenate appearance to the margin tetraophthalmum
Granules giving a denticulate appearance to the margin. margaritiferum
19. Segments bordered by papillae-like granules; end view with truncate ends cristatum
Pearly granules neither papillae-like nor confined to the margin; end view with rounded ends 20
20. Segments bordered with denticulated crenatures caelatum
Segments not crenate 21
21. Segments reniform, three times broader than long commissurale
Segments not reniform, about twice as broad as long 22
22. End mar straight Broomeii
End margin not straight 23
23. Inflation reaching to or beyond the end margin ornatum
Inflation confined to the centre of the segment biretrum
24. Frond rough with pearly granules which give a denticulate appearance to the margin 25
Frond smooth; margin entire 26
25. Segments spherical orbiculatum
Segments subquadrate cylindricum
26, Segments spherical moniliforme
Segments not spherical 27
27. Segments broader than long (hemispherical or semi-oval) connatum
Segments as long as or longer than broad 28
28. Frond (oval) large, distinctly visible to the naked eye turgidum
Frond minute, scarcely visible to the naked eye 29
29. Frond fusiform or oblong 30
Frond not tapering; ends broadly rounded 31
30. Puncta distinct Cucurbita
Puncta wanting, or very indistinct Thwaitesii
31. Endochrome in longitudinal fillets curtum
Endochrome not in fillets attenuatum
9.Xanthidium
1. Spines divided at the apex armatum
Spines subulate 2
2. Segment without central projections, its spines usually four ? octocorne
Segment with central projections; spines eight or more 3
3. Spines scattered aculeatum
Spines marginal, in pairs 4
4. Segments with a solitary basal spine on each side, the rest in pairs cristatum
Segments with basal spines in pairs 5
5. Central projections minute and smooth in end view fasciculatum
Central projections prominent and denticulate in end view Brebissonii
10. Arthrodesmus
  Segments elliptic convergens
Segments with truncate ends Incus
11. Staurastrum
1. Frond neither rough nor spinous; angles in end view broadly rounded. 2
Frond either rough, spinous, or with elongated angles 5
2. Angles with a minute nipple-like projection 3
Angles rounded, without a projection 4
3. Sides convex tumidum
Sides convave brevispina beta
4. Segments elliptic in the front view muticum
Segments semiorbicular in the front view orbiculare
5. Frond with awned inflated angles, but without other spines 6
Frond either awnless or having other spines besides the awns 11
6. Frond rough with minute granules lunatum
Frond smooth 7
7. Segments connected by a ribbon~like band cuspidatum
Segments connected without a band 8
8. Awns, in front view, terminating conical lobes aristiferum
Awns, in front view, not terminating lobes 9
9. Awns straight, rarely converging; segments, if elliptic, not turgid dejectum
Awns curved and converging; segments turgid-elliptic 10
10. Segments inflated; awns inconspicuous brevispina
Segments turgid; awns distinct Dickiei
11. Frond smooth, glabrous; angles prolonged into processes divided at the apex 12
Frond either rough, spinous or dentate; divided processes, if any, rough 13
12. End view with an elongated process from each angle brachiatum
End view.with short geminate processes from each lobe laeve
13. Frond with simple, acute, uniform spines; angles in end view broadly rounded and entire 14
Frond, if spiuous, either with some or all of its spines not subulate, or with angles not rounded in the end view 16
14. Segments quadrangular in the front view Hystrix
Segments semi-orbicular or reniform in the front view 15
15. Spines conico-triangular ; end view of frond with convex sides. muricatum
Spines hair-like; end view of frond with convex or slightly concave sides hirsutum
Spines thorn-like; end view of frond with very concave sides. teliferum
16. Segments quadrangular in the front view quadrangulare
Segments not quadrangular in the front view 17
17. Segments in front view with a forked spine on each side, otherwise smooth avicula
Segments in front view having many spines or none 18
18. Frond smooth; end view acutely triangular, with two acute accessory spines to each angle 19
Frond rough or spinous; angles in the end view not acute 20
19. Segments in the front view with a forked spine on each side. monticulosum
Segments in the front view with all their spines slender, simple, and directed outwards pungens
20. Frond rough with large granules; end view with five or six rounded and toothed lobes sexcostatum
Frond either minutely granulate or spinous; angles in end view either entire or elongated into rays 21
21. Frond rough with puncta-like granules; angles or rays in end view entire 22
Frond either spinous or having the angles or rays tipped with spines 28
22. End view with rounded or truncate short rays or angles 23
End view with elongated slender rays or processes 27
23. End view with slightly concave sides and broadly rounded angles punctulatum
End view either with very concave sides or with angles elongated into short rays 24
24. End view triangular 25
End view with four or more angles or rays 26
25. Segments rounded on each side alternans
Segments tapering on each side into a short process tricorne
26. Segments twice as broad as long ; end view 4 -rayed dilatatum
Segments as long as broad; end view 5- to 7-rayed margaritaceum
27. Segments with converging processes Arachne
Segments with diverging processes tetracerum
28. Frond rough with minute granules; spines, besides those that tip the rays, few and inconspicuous, or none 29
Frond with evident, more or less forked or emarginate spines 33
29. Processes much elongated 30
Processes short 31
30. Processes divergent in the front view paradoxum
Processes parallel in the front view gracile
31. Processes convergent in the front view cyrtocerum
Processes nearly straight in the front view 32
32. Segments fusiform tricorne beta
Segments ventricose; not fusiform polymorphum
33. End view with broad, emarginate or bifid lobes enorme
End view with the angles either rounded or tapering into lobes 34
34. Spines scarcely distinguishahle from the associated granules asperum
Spines distinct 35
35. End view with convex sides and rounded angles, and fringed with stout forked spines spongiosum
End view with concave sides; angles not rounded 36
36. Each angle in end view terminated by a spine with two accessory spines spinosum
Each angle in end view tapering into a process tipped by three or four acute points or spines 37
7. Each side in end view with two slender forked spines, with or without other spines; rays slender vestitum
End view without slender forked spines at the sides ; rays short, stout. 38
38. Rays curved in end view controversum
Rays straight in end view aculeatum
12. Didymocladon
      furcigerus
13. Tetmemorus
1. Frond fusiform in the front view; puncta distinct, scattered. granulatus
Frond not fusiform in the front view; puncta either very indistinct or in longitudinal rows 2
2. Puncta distinct, in longitudinal rows Brebissonii.
Puncta either wanting or indistinct and scattered laevis.
14. Penium
1. Frond granulate or striate 2
Frond smooth 3
2. Granules arranged in longitudinal rows margaritaceum
Granules scattered Cylindrus
3. Endochrome transversely divided into four portions interruptum
Endochrome not divided into more than two portions 4
4. Frond lanceolate, fusiform or elliptic 5
Frond cylindrical6
5. Frond elliptic; fillets undulating Digitus
Frond lanceolate or fusiform; fillets straight closterioides
6. Ends truncate truncatum
Ends rounded 7
7. Sporangium orbicular; conjugated fronds deciduous Jenneri
Sporangium at first quadrate ; conjugated fronds persistent Brebissonii
15. Docidium
1. Frond neither constricted nor inflated ?asperum
Frond constricted; segments mostly inflated at the base 2
2. Suture inconspicuous; segments not inflated minutum
Suture distinct; segments inflated at their base 3
3. Frond stout; suture projecting at the sides 4
Frond slender; suture not projecting 5
4. Segments with one inflation; extremities attenuated truncatum
Segments with several inflations; extremities not attenuated. nodulosum
5. Extremities clavate clavatum

Extremities not clavate

6
6. Ends bordered with tubercles Ehrenbergii
Ends destitute of tubercles Baculum

16. Closterium
1. Frond suddenly constricted at each end into a conical point attenuatum
Frond not constricted at the ends 2
2. Frond striated, tapering into a beak at each end, lower margin prominent at the middle 3
Frond not rostrate; if stnated, its lower margin not prominent at the middle 6
3. Beaks setaceous, as long as or longer than the body 4
Beaks linear, much shorter than the body 5
4. Beaks much longer than the body setaceum
Beaks about as long as the body rostratum
5. Frond much inflated at the middle, rapidly tavering at each end Ralfsii
Frond slightly inflated at the middle, gradually tapering at each end lineatum
6. Frond minute, acicular. sporangium cruciform 7
Frond not acicular; sporangium orbicular 8
7. Ends obtuse Cornu
Ends acute acutum
8. Frond semilunate or semilanceolate, the lower margin inclined upwards at the ends 9
Frond having either truncate ends or its lower margin inclined downwards at the ends 12
12. Vesicles numerous, scattered Lunula
Vesicles in a longitudinal row 10
10. Ends of frond slightly curved upwards; striae distinct turgidum
Ends of frond straight; striae none or indistinct 11
11. Frond linear-lanceolate; ends conical, obtuse acerosum
Frond semilanceolate; ends subacute lanceolatum
12. Frond smooth, crescent-shaped 13
Frond either not crescent-shaped or else distinctly striated 17
13. Vesicles numerous, scattered Ehrenbergii
Vesicles in a longitudinal row 14
14. Empty frond colourless; ends rounded 15
Empty frond usually reddish; ends subacute 16
15. Lower margin of frond inflated at the middle moniliferum
Frond not inflated at the middle Jenneri
16. Frond inflated at the middle Leibleinii
Frond slender, not inflated at the middle Dianae
17. Lower margin of frond inclined upwards at the truncate ends; striae none or indistinct didymotocum
Ends of frond inclined downwards ; striae distinct 18
18. Striae three to seven, prominent 19
Striae numerous, fine 20
19. Frond semilunate or crescent-shaped costatum
Frond linear angustatum
20. Frond narrow-linear, nearly straight juncidum
Frond tapering, curved 21
21. Striae crowded; sutures one to three striolatum
Striae not crowded; sutures usually more than three intermedium
17. Spirotaenia
  Spire solitary, broad, conspicuous condensata
Spires several, narrow, obscure obscura
18. Ankistrodesmus
      falcatus.
19 Pediastrum
1. Lobes of marginal cells bifid or truncato-emarginate 2
Lobes of marginal cells entire 3
2. Cells four Tetras
Cells seven, circularly disposed round a central one Heptactis
Cells eleven, circularly disposed round five or six central ones biradiatum
3. Marginal cells crescent-shaped; connecting substance coloured Selenaea
Cells not crescent-shaped; connecting substance hyaline 4
4. Cells granulate granulatum
Cells smooth 5.
5. Lobes of marginal cells terminated by obtuse processes ellipticum
Lobes of marginal cells acute 6
6. Marginal cells with notches as wide as the cells pertusum
Notches much narrower than the cells 7
7. Marginal cells four simplex
Marginal cells more than four 8
8. Six cells circularly disposed round two central ones Napoleonis
Cells arranged in two or more circles 9
9. Lobes of marginal cells angular, not tapering angulosum
Lobes of marginal cells tapering Boryanum
20. Scenedesmus
1. Cells obtuse 2
Cells acute or acuminate 3
2. Cells cylindrical or oblong quadricauda
Cells ovate obtusus
3. Cells ventricose at the middle 4
Cells slender, not at all ventricose 5
4. Cells in a single Zigzag row acutus
Cells either in two rows or not zigzag obliquus
5. Outer cells crescent-shaped, inner straight, all approximate dimorphus
Cells curved, distant duplex

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adapted for the internet: Monika Engels & Peter v. Sengbusch - engels@botanik.uni-hamburg.de

Culture Collection of Conjugatophyceae (SVCK)