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Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Schizotrema schizolomum (Müll.Arg.) Mangold & Lumbsch

in A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 657 (2009)

Leptotrema schizolomum Müll.Arg., Nuovo Giorn. Bot. Ital. 21: 49 (1889).

T: Beagle Channel, Ushuaia, Fuegia, Argentina, 1885, C.L.Spegazzini 101; lecto: G, fide A.Mangold, J.A.Elix & H.T.Lumbsch, Fl. Australia 57: 657 (2009).

Thelotrema hypomelaenum Müll.Arg., Bull. Herb. Boissier 3: 314 (1895). T: N.S.W., locality unknown, C.Knight 16 p.p.; holo: G.

  Thallus endophloeodal to epiphloeodal, to c. 300 µm thick, pale grey to pale yellowish grey or pale greyish green to yellowish olive, dull to slightly glossy, smooth to uneven, continuous to strongly verrucose or verruculose, often distinctly rimose. Protocortex ±continuous, to c. 20 µm thick, this rarely becoming distinctly conglutinated and forming a true cortex of periclinal hyphae. Algal layer continuous and well developed; calcium oxalate crystals abundant, small to large, solitary or in clusters. Vegetative propagules not seen, although isidia-like structures occasionally present in strongly verruculose specimens. Ascomata conspicuous, to c. 1.2 mm diam., ±rounded, perithecioid in younger stages, becoming indistinctly apothecioid, erumpent, regenerating, usually solitary, rarely fused, mostly ±emergent, hemispherical to depressed-urceolate, occasionally rather irregular. Disc not visible from above, very rarely becoming partly visible, pale greyish to whitish, epruinose. Pores minute to small, to c. 0.25 mm diam., rounded to irregular, formed by the apical margin of the proper exciple; pore margin/visible part of the proper exciple ±split, fused to indistinctly free, off-white to pale brownish, incurved. Proper exciple thick, apically free, brown to carbonised, occasionally with substratum inclusions, strongly amyloid at the base. Inner subhymenial layer dark brown to carbonised, occasionally subtending a hyaline layer of newly developing hymenium. Hymenium to c. 200 µm thick; paraphyses straight to slightly bent; lateral paraphyses conspicuous, to c. 30 µm long; true columella absent, but columella-like structures occasionally present in newly developing ascomatal generations (raised subhymenial layer) or in fused ascomata. Epihymenium lacking granules and crystals. Asci 1–4 (–6)-spored; tholus and lateral ascus walls initially thick, thin when mature. Ascospores muriform, mostly oblong to ellipsoidal, with rounded to narrowly rounded ends, hyaline to yellowish, rarely pale brownish when post-mature, non-amyloid to faintly amyloid (older ascospores), (40–) 60–120 (–130) × 20–40 µm, with numerous locules; locules predominantly ±angular and irregular, becoming smaller with age; transverse septa thin, especially distinct in immature ascospores, mostly ±irregular; ascospore wall and endospore initially slightly thickened, becoming thin; wall non-halonate.
CHEMISTRY: Strain I: Thallus K–, C–, P–; no secondary compounds detectable by TLC. Strain II: Thallus K+ yellow → deep red, C–, P+ orange; containing salazinic acid.
  Occurs on bark and wood in eastern Qld, N.S.W. and Tas.; in cool-temperate to warm-temperate rainforest, less common in montane, subtropical and tropical rainforest (100–1500 m). Also in southern Argentina and New Zealand.  
  Mangold et al. (2009)  

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Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

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