Ghost-like pal1 gametophytes appear to have decreasing amounts of chlorophyll as they enlarge. Nonetheless, they grow to sexual maturity within two weeks and can self or cross-fertilize. At 1-2 weeks, pal1 gametophytes are slightly smaller than wild type and their pale phenotype makes them clearly recognizable in a segregating population (use of transmitted light is best). This is a recessive mutation in sporophytes and leaves of pal1/pal1 homozygotes show a yellow –green phenotype when viewed with reflected light (from the side or top). These attractive sporophytes are quite viable, but slower growing than wild type. This EMS-induced mutation is available only in an F1 hybrid stock. The F1 spores can be used very effectively in the Genetics in Action Kit (15-6708), as a substitute for polka dot (cp).