Siphulastrum mamillatum
≡Lecidea mamillata Hook.f. & Taylor, Lond. J. Bot. 3: 637 (1844).
Description : Flora (1985: 526–527).
Chemistry : Argopsin and ±triterpenoids.
S: Otago (Old Man Ra., Silver Peaks, Maungatua). C: On exposed subalpine to alpine peat, with bryophytes and Dracophyllum. Known also from Chile, Tierra del Fuego, Marion and Prince Edward Is, Falkland Is, South Georgia, Tasmania and Macquarie I. (Jørgensen & Galloway 1992b; Galloway & Quilhot 1999; Øvstedal & Gremmen 2001; Øvstedal & Lewis Smith 2001; McCarthy 2003c, 2006).
Austral.
Illustration : Jørgensen & Galloway (1992b: 292, fig. 99D).
Siphulastrum mamillatum is characterised by: the terricolous habit; the densely caespitose, mat-forming squamulose thallus; the squamules crowded, nodular-papillate, flattened or subterete, grey-black above, yellow-brown below, margins often white-pruinose, often forming dorsiventral, foliose rosettes; minute apothecia, to 0.5 mm diam., projecting above squamules, the disc plane, brown-black, glossy, epruinose; ascospores ellipsoidal with rounded apices, 11–14 × 5–7 μm.
