Hildenbrandia rubra (Sommerfelt) Meneghini
Description: Rose-red or brownish-red crusts,
0.2-0.5 mm thick, of indefinite extent, closely adherent to
substrate, without rhizoids; without surface markings.
Habitat: On rocks and stones at all tidal
levels, often in splash zone in caves, and subtidal, widely
distributed, extemely abundant, particularly in upper shore
where it appears to be very tolerant to extremes of temperature,
light and salinity.
Similar species: Difficult to distinguish from
the closely-related Hildenbrandia prototypus Nardo (not
included here), with which it frequently occurs.
Key characteristics: Thin, extensive crust with
irregular outlines; it is the only thin red crust that grows on rock in the
upper half of the shore.


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