Porphyrostromium boryanum (Montagne) P.C.Silva
Also known as:
Erythrotrichia boryana (Montagne) Bory
Description: Ribbon-like rose-red, 10-800
µm broad, simple, sinuate, unbranched blades often curled
at margins, one cell in thickness, arising from small disk on
cell in thickness growing epiphytically on various algae.
Tapering to a narrow point with a single apical cell. Marure
cells rounded, 10-20 µm in diam., and often in regular
lateral and vertical rows, but becoming more irregular as blades
mature.
Habitat: Epiphytic on Fucus,
Zostera and various smaller algae in the lower
intertidal and shallow subtidal.
Key characteristics:
Epiphytic habitat. Unbranched, curled blades one cell in
thickness.
Similar species: Porphyropsis coccinea.
Distribution: Svalbard south to Canary Islands;
western Mediterranean and Adriatic; west coast of Africa south
to South Africa, west coast of N. America.
Photographs: Carnsew Pool, Hayle, Cornwall, England; on
Fucus serratus. 14 Apr 2018 © David
Fenwick, 16 April 2018. Top: habit of plant removed from
Fucus serratus
(longest blade about 4 mm. Bottom: cells of young and mature
blades (scale = 10 µm).
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