Australian Biological Resources Study
| Checklist of the Lichens of Australia and its Island Territories | ||
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References | ||
| Pyrenocollema montanum P.M.McCarthy & Kantvilas | ||
| Lichenologist 31: 227 (1999). T: The Thumbs, Tas., 42°39'S, 146°18'E, alt. 1080 m, on sheltered quartzite, 3 Feb. 1973, G. C. Bratt & K. M. Mackay 73/39 (part); holo: HO 39967; iso: AD 20710. | ||
| Thallus silicolous, epilithic, crustose, greyish black to black, determinate, but with effuse margins, forming colonies to c. 5 cm diam., (30–) 50–100 (–160) µm thick; surface richly rimose to areolate (cracks closing when the thallus is wetted), matt, ± smooth to minutely uneven, with a 10–20 µm thick, dark olive-brown, upper cortex-like layer, composed of rounded to angular, ± thick-walled, 2–4 µm wide cells. Areolae 0.1–0.4 (–0.7) mm wide, angular, usually plane, occasionally convex, frequently rimulose. Photobiont a cyanobacterium (Hyella sp.?), in a 20–60 µm thick layer; cells thin-walled, yellow-orange, 10–20 × 7–15 µm, solitary or in short filaments, mostly vertically elongate-ellipsoid to ± cylindrical, some appearing to contain endospores. Hyphae long-celled, 2–3 (–4) µm wide, vertically oriented among the photobiont cells, variously oriented elsewhere. Prothallus not apparent. Basal layer dark brown, 20–60 (–100) µm thick, dominating older parts of the thallus. Ascomata perithecioid, moderately to very numerous, usually solitary, semi-immersed and hemispherical to 1/3-immersed and subglobose, usually matt black, occasionally rather glossy, (0.22–) 0.33 (–0.5) mm diam. Apex rounded to concave about the ostiole, often becoming cracked and often deeply crateriform; ostiole depressed, 30–50 µm wide. Involucrellum brownish black, superficially smooth to minutely uneven, mostly contiguous with the excipulum and extending to excipulum-base level, occasionally somewhat incurved below and merging with the basal layer of the thallus, (50–) 75–100 (–120) µm thick, composed of thick-walled hyphal cells. Excipulum 25–33 µm thick; cells 9–12 × 4–5 µm; outer layers brownish black, especially towards the base; inner layers medium brown. Centrum subglobose to obpyriform, 0.15–0.3 mm diam. Subhymenium 20–40 µm thick. Hymenial gel Lugol's I–. Pseudoparaphyses short-celled, 1–2 µm wide, richly anastomosing throughout. Asci fissitunicate, broadly ellipsoid, obovoid or shortly clavate, rarely ovoid, 4–8-spored, 100–160 × 40–55 µm, tapering or abruptly constricting to a stalk 5–7 µm thick, at first with a broad or elongate, beak-like ocular chamber that becomes shorter and comparatively broad at maturity; ascoplasma Lugol's I+ dark red-brown; side walls 2–3 µm thick, Lugol's I–; apical wall c. 8 µm thick at maturity. Ascospores colourless, ovoid-fusiform, 1-septate, thin-walled, massed in the ascus, usually straight, with rounded apices, usually slightly to markedly constricted at the septum, (28–) 41 (–58) × (11–) 15.5 (–21) µm; cells similar in size and shape or distal cell slightly broader and more rounded; wall smooth, c. 0.7 µm thick; perispore to 3 µm thick; contents minutely granulose or guttulate. Conidiomata not seen. | ||
| Grows on hard, quartz-dominated alpine rocks in south-western Tas.; endemic. | ||
| McCarthy & Kantvilas (1999b) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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