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Marine species of  Prasiola  are most common on rocky shores of the North Atlantic and North Pacific Oceans.  Prasiola linearis  is a little-known member of this group, whose known distribution is restricted to coastal marshes of Pacific North America. The little information available on this species is mostly based on the original description; its life history has not been previously reported. Reproduction and life history were investigated in a series of experiments conducted in different combinations of culture medium, temperature, daylength and photon irradiance. The alga reproduced by aplanospores that were produced in the apical part of the blade. Upon release, each aplanospore reproduced a new thallus; sexual reproduction, which occurs in other marine species of  Prasiola  ( P. stipitata  and  P. meridionalis ) was not observed in  P. linearis . No variation in reproductive patterns was observed between different combinations of factors tested; however, the alga showed very weak growth at 20°C. The life history of  Prasiola linearis  consists of a repetition of the same morphological phase reproducing by aplanospores. The diversity of life histories observed in marine species of  Prasiola  is illustrated and discussed.

Reproduction and life history of the green alga Prasiola linearis Jao (Trebouxiophyceae, Chlorophyta)