Monostroma grevillei (Thuret) Wittrock
Description: Gametophyte thallus sac-like when
young, becoming sheet-like, light- to olive-green, delicate, to
100 mm (occasionally much larger), attached by a small disk.
Often with trapped oxygen bubbles (above) on sunny days. Spring
annual, athough the basal parts and the shell-boring sporophtes
persist throughout the year.
Habitat: in rockpools and on rock from mid-tide
downwards. Commonly epiphyte on Ceramium,
Polysiphonia, and
Corallina officinalis
in rock pools. Abundant and common January-May.
Distribution: Common and widespread but often
under-recorded in Britain and Ireland; Iceland and Norway south
to France. Mediterranean records require confirmation.
Key characteristics: saccate plants generally
obvious; delicate thallus; abundance in spring.
Similar plants in low-slainity situations are likely to be
Gayralia oxysperma.
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