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 tasmanicum P.M.McCarthy & Kantvilas. | ||
| Herzogia 14: 39 (2000). T: north slope of Proprietary Peak, Tas., 42°10'S, 145°35'E, c. 800 m, on wet soil in buttongrass moorland, 15.8.1995, G. Kantvilas 70/95; holo: HO. | ||
| Thallus terricolous, crustose, almost entirely immersed in the substratum, pale to medium greyish, diffuse, forming colonies to c. 5 cm diam. Photobiont a cyanobacterium; cells thin-walled, yellow-orange or pale yellowish brown, solitary and 8 - 16 × 5 - 12 µm, or in ellipsoid or subglobose, gelatinous clusters of 50 - 100 cells that are 3 - 7 × 2 - 5 µm. Hyphae long-celled, 2 - 4 µm wide, variously oriented. Prothallus not apparent. Basal layer absent. Ascomata perithecioid, very numerous, usually solitary, 2/3-immersed and appearing convex to almost superficial and subglobose, usually matt black, occasionally rather glossy, (0.19 - )0.23( - 0.3) mm diam., later eroding and leaving only the black, concave excipulum-base. Apex rounded. Ostiole gaping, 25 - 40( - 60) µm wide. Involucrellum absent. Excipulum black, 50 - 60 µm thick near the apex, 20 - 25 µm thick at the base. Centrum subglobose to obpyriform, 0.15 - 0.21 mm diam. Hymenial gel Lugol's I - . Pseudoparaphyses short-celled, 1 - 2 µm wide, richly anastomosing throughout. Asci fissitunicate, obovoid or shortly clavate, rarely ovoid, (4 - )8-spored, 80 - 145 × 35 - 62 µm, tapering or abruptly constricting to a stalk 7 - 10 µm thick, at first with an elongate, c. 10 µm wide, beak-like ocular chamber that becomes shorter and comparatively broad at maturity; ascoplasma Lugol's I+ dark red-brown; side walls 2 - 5 µm thick, Lugol's I - ; apical wall c. 7 - 10 µm thick at maturity. Ascospores colourless, ovoid-fusiform, 1-septate (very rarely 3-septate), massed in the ascus, usually straight, with rounded apices, usually slightly to markedly constricted at the septum, (29 - )41.5( - 54) × (12 - )16( - 22) µm; distal cell broader and more rounded than proximal; wall smooth, c. 1 µm thick; perispore to 3 µm thick; contents minutely granulose, occasionally guttulate. Conidiomata not seen. | ||
| Known only from the type locality in western Tas.; grows on gritty, consolidated soil, semi-permanently moist from seepage from overhanging banks of peat. | ||
| McCarthy & Kantvilas (2000) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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