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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
Letrouitia transgressa (Malme) Hafellner & Bellem.

in J.Hafellner, Nova Hedwigia 55: 710 (1983)

Bombyliospora domingensis f. transgessa Malme, Ark. Bot. 18A(12): 5 (1923).

T: Porto Alegre, Rio Grande do Sul, Brazil, 27 Sept. 1892, O.Malme, Exp. Iter Regn. Lich. 465E; holo: S; iso: UPS, US n.v.

  Thallus yellow, greenish yellow to yellow-orange, thin, smooth to verrucose; verrucae laminal; soredia and isidia absent. Apothecia common, scattered, ±rounded or somewhat distorted, sessile, constricted at the base, 0.5–1.5 mm wide; disc reddish brown to brown-black, weakly concave to ±plane; margin prominent, reddish orange, raised above the disc when immature, glossy, K+ purple; proper exciple of hyaline radiating agglutinated hyphae, the outer layer encrusted with orange-brown anthraquinone crystals, the inner layer colourless, lacking anthraquinone crystals. Epihymenium encrusted with yellow-brown crystals, the crystals eroded in older apothecia. Hymenium not inspersed, colourless, 90–120 μm thick; hypothecium colourless. Asci (4–) 8-spored, 70–100 × 15–30 μm. Ascospores ellipsoidal, submuriform, primarily transversely septate, with 8–12 lens-shaped locules, the locules with 0–3 vertical septa, 25–60 × 11–20 μm. Conidia not seen.
CHEMISTRY: Thallus and apothecia K+ purple; both containing fragilin (major), parietin (major), ±emodin (trace), ±7-chloroemodin (trace), ±7-chlorofallacinal (trace), ±7-chloro-teloschistin (trace), ±7-chloroparietinic acid (trace), ±fragilin bisanthrone (trace), ±physcoin bisanthrone (trace), ±exuviatic acid B (minor or trace).
  Known from eastern Qld and northern N.S.W.; occurs on bark in rainforest and coastal forest. Also in South America, Africa, Asia, Papua New Guinea and New Caledonia.  
  Elix (2009k)  

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

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