Ceramiales Spyridiaceae

Spyridia alternans B0rgesen

Thallus form and type

Substratum

Occurrence

Season

Abundance

Description

Remiform with uniseriate ramuli Intertidal rocks, calcareous substrata Sub littoral zone, rock pools November-April Scanty

Plants bright red in colour, up to 25 cm or more in height, caespitose, segmented, irregularly branched, articulate and corticated in the lower parts (Figs. a, b); axes 1.5 mm broad, gradually attenuated towards the apex, branches compressed in the upper parts with short branchlets; branchlets or ramuli uniseriate, distichously arranged, corticated near the septa, about 300 |om long 20 - 50 |om broad, ending with 2 - 3 spines.

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