Actinotrichia fragilis (Forssk.) Boergesen
Dansk Botanisk Arkiv 6 (1932)
Conservation Code:
Not threatened
Naturalised Status: Native to Western Australia
Name Status:
Current
Scientific Description
John Huisman & Cheryl Parker,
Monday 20 June 2011
Habit and structure. Thallus to 7 cm high, grey-pink to orange-red, forming a hemispherical or spreading clump, subdichotomously branched at intervals of 2–10 mm. Axes 250–600 µm in diameter; emergent filaments either absent, randomly arranged, or in whorls at intervals of 150–200 µm. Medullary filaments 5–12 µm in diameter. Cortex 3 or 4 cells thick; inner cells 22–32 µm in diameter, with occasional lateral fusions; epidermal cells turbinate, 20–27 µm in diameter; emergent filaments cylindrical, to 550 µm long, with cells 10–13 µm in diameter.
Reproduction. Spermatangial cavities 150–250 µm in diameter; spermatangia spherical to obovoid, c. 5 × 7 µm. Cystocarps not observed. Tetrasporangia subspherical, 25–27 × 22–25 µm.
Distribution. Known from
Habitat. A. fragilis
grows on rock or coral platforms in the subtidal.
