Myrionema strangulans Greville
Description: Greenish-brown to medium brown,
regularly discoid, 0.5–2 (–5) mm across, epiphytic
on Ulva, discs often merging. Basal layer
monostromatic, of subdichotomous, radiating, closely adjacent
filaments adherent to the host surface, with marginal cells more
elongate and inner cells mostly 8–14 µm long,
5–8 µm broad and 4–8 µm high. Erect
assimilatory filaments forming a shallow even dome, arising from
almost every cell of the basal layer commencing 10–20
cells within the disc margin, when mature 100–130 and
5–8 cells high, with the cells 15–25 µm long
and 4–6 µm in diameter, with the terminal cell
slightly clavate, 10–25 µm long and 7–10
µm in diameter; cells with several discoid to
irregularly-shaped phaeoplasts, each with 1 (–2)
pyrenoids. Hairs scattered, 8–12 in diameter.
Habitat: Epiphytic on older plants of
Ulva species, particularly distromatic types.
Key characteristics: Small brown discs.
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