Unispore

Fletcher (1978) demonstrated that in Britain unispores from Ralfsia clavata developed into germlings that eventually produced blades identifiable as Petalonia fascia and that unispores from Microspongium gelatinosum ultimately produced narrow, terete thalli identifiable as Scytosiphon lomentaria.

Culture studies of Newfoundland Acrothrix revealed an asexual, heteromorphic, monophasic life history which includes a unispore-producing macrothallus and a recycling, plurispore-producing microthallus.

The plurispores and unispores produced by the erect thalli at 10 degrees C under SD conditions once again developed into new prostrate thalli.