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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
Dibaeis sorediata Kalb & Gierl
  in C.Gierl & K.Kalb, Herzogia 9: 615 (1993). T: Sky Window Picnic area, Eungella Rd, Dicks Tableland, c. 60 km E of Mackay, Qld, 30 Aug. 1992, K.Kalb 25508; holo: CANB; iso: Herb. K.Kalb, GZU, Herb. J.Hafellner, UPS (all n.v.).  
  Primary thallus thin and ±smooth over rock or fine soils to verruculose over bryophytes, paler than underlying substratum, pale ochre to dull green (bright lettuce-green when wet) with white hyphae visible between lichenised patches (clusters of photobiont cells visible at ×20 when wet), sorediate. Soralia initially small, orbicular and verruciform to capitate, eventually to 0.5–1 (–1.5) mm tall, coalescing into patches 2–4 mm wide, pale greenish white, paler than primary thallus, farinose to granular, rich in photobiont cells thus giving upper layer a distinct green tinge, with or without abundant colourless crystals. Secondary thallus absent to abundant. Apothecia subsessile and adnate to shortly stipitate, to 0.3 (–0.5) mm diam.; stipe robust, short, non-lichenised, thick, smooth to scurfy or farinose, concolorous with primary thallus to buff to dirty white to pale rose-pink where internal tissue is exposed, relatively regular in cross-section, neither strongly furrowed nor markedly tapered; disc pale flesh-pink to rose-pink, darker than margin, usually densely pruinose, smooth to scabrid, shallowly concave to ±plane to slightly convex and undulate-distorted to ±cracked and fissured with age; margin usually concolorous with stipe, ±pruinose, smooth when young to undulate and cracked with age, sometimes fusing with margin of adjacent apothecia. Ascospores ellipsoidal to narrowly ovoid, 0 (–1)-septate, (9.5–) 10.5–12 (–15.5) × (3–) 3.5–4.5 (–5.5) µm (Australian specimens). Pycnidia not seen. CHEMISTRY: Primary thallus and soralia K– or K+ pale yellow, UV+ white; apothecia (disc and stipe) K+ yellow, P+ yellow-orange; containing baeomycesic acid (major), squamatic acid (±trace), consquamatic acid (±trace), barbatic acid (±faint trace) and ursolic acid (±trace).
  Occurs in wet-tropical and subtropical rainforest of coastal and adjacent ranges in Qld and northern N.S.W. Grows on moist soils of roadsides, creek banks and old termite nests or on rocks in shaded, sheltered sites. Also known from Réunion and Nepal.  
  Johnston (2001b)  

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

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