in Bulletin of the British Museum (Natural History), Botany Series 16 (2): 193 - 195.
Basionym: xxx.
Synonym: Index Fungorum
Type: xxx.
Thallus: Corticolous and saxicolous, greenish-grey, erect, rigid to flaccid, inflated and shrubby or flattened and almost foliose, 1 - 3 cm high; branching from the base only; branches variable in width, often bursting open to reveal the medulla, giving a false effect of gross inflation, with flattening of the thallus the areas directly below the apothecia remain the only part of the thallus with a central cavity; perforations when present, large, round to elongate, splitting to reveal the medulla; medulla loosely woven, sparse, adhering in patches to the inner cortex wall, the wall often marked with reticulate strands of chondroid tissue; sometimes pseudocyphellate; holdfast delimited; soralia absent. Apothecia numerous, terminal, not spurred; sometimes laminal; disc 2 - 5 (- 8) mm diam., initially concave becoming flat; margin entire, inroUed; spores ellipsoid, mainly curved, some straight, (10 -) 12 - 16 x 4 - 5 (- 6) µm.
Photobiont:
Chemistry: Salazinic acid and usnic acid.
Ecology: It is mostly coastal in occurrence. Occasionally R. fissa occurs on rocks and produces a much reduced growth form. On Hunter Island, Bass Strait, specimens grow on quartzite; Tasmanian collections from Cape Deslacs and Bruny Island do not record the rock type.
Molecular data: Genbank
Distribution: Database
Note: