Abstract
Abstract A complanate Schmitzia species (Calosiphoniaceae) has been found growing on subtidal cobbles in the British Isles. The ephemeral erect plants are uniaxial, filamentous and gelatinous and bear spermatangia and three-celled carpogonial branches in June/July and carposporophytes from late July to September. Carpospores formed sterile crustose plants and loosely-organized filaments bearing tetrasporangia in culture at 15°C, 16: 8 h (long day, LD). Obliquely cruciate to irregularly zonate tetrasporangia were formed on the crustose plants after transfer to 10 or 15°C, 8: 16 h (short day, SD). At 15°C LD some crusts, which may have been the result of inoculation of filaments from the parent gametophytes rather than germinated carpospores, formed erect filaments which grew poorly. On transfer to SD, however, normal erect axes were formed and these have not reproduced. Tetraspores released in culture formed discs which gave rise to erect axes at 10 or 15°C, SD, but not at LD. Erect axes were similar in co...
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