Abstract
The phenology, morphology and life history of Saundersella saxicola were studied in culture. At Ohma, Aomori Prefecture, Japan, the species is an annual appearing in March, growing during spring, and maturing in May. In culture, the zoospores show a mediate discal-type of germination, and develop into Ralfsia-like crustose thalli forming intercalary plurilocular sporangia with terminal sterile cells. Erect filamentous thalli develop on the crustose thalli, forming radiate multicellular assimilatory filaments and unilocular sporangia. The following characters of the species suggest its distant systematic relation with Saundersella and rather closer position to Ralfsia and its relatives including Analipus: single sinuate cup-shaped chloroplast without pyrenoid per cell; mediate discal-type of germination; and intercalary plurilocular sporangia with terminal sterile cells. Accordingly, a new genus Heteroralfsia to accommodate the species is proposed.
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