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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
Reimnitzia santensis (Tuck.) Kalb

Mycotaxon 79: 325 (2001)

Thelotrema santense Tuck., Proc. Amer. Acad. Arts Sci. 5: 406 (1862); — Leptotrema santense (Tuck.) Zahlbr., Cat. Lich. Univ. 2: 635 (1923).

T: Santee, South Carolina, U.S.A., 1860, H.W.Ravenel s.n.; lecto: BM n.v., fide G.Salisbury, Rev. Bryol. Lichénol. 38: 288 (1972).

  Thallus immersed to superficial, to c. 300 µm thick, rarely bulging, greyish to pale greyish green or greyish olive, often distinctly speckled, dull, smooth to slightly pruinose or uneven, continuous to verruculose, with or without fissures, or coarsely cracked. Cortical structures absent. Photobiont trentepohlioid. Algal layer usually continuous and well developed, appearing discontinuous due to crystal inclusions; calcium oxalate crystals abundant, small to large, scattered or clustered, forming columns. Medulla usually absent; basal part of the thallus often with conglutinated ±periclinal hyphae, forming a lower cortex-like layer. Isidia often present and abundant, concolorous with the thallus, unbranched, initially globular, becoming vermiform, with a ±constricted base, to c. 1.5 mm long. Ascomata conspicuous, to c. 2 mm diam., ±rounded, more irregular when ascomata are fused, chroodiscoid, erumpent, immersed to slightly raised. Disc usually completely visible from above, greyish- to dark greyish-pruinose. Proper exciple not visible from above; thalline rim margin becoming broad to gaping, to c. 1.8 mm diam., entire or more often ±coarsely split and lobed, ±eroded, whitish or brighter than the thallus, thin, becoming thick, predominantly erect to slightly recurved in older stages. Exciple fused, hyaline to pale yellowish brown internally, brownish marginally, apically dark brown to, rarely, slightly carbonised and with greyish granules, non-amyloid. Hymenium to c. 120 µm thick, not inspersed, distinctly conglutinated; paraphyses straight, ±interwoven, occasionally sparingly branched, particularly towards the margins and the apical hymenium; tips slightly thickened and irregular; lateral paraphyses not seen (according to Frisch et al. (2006) scattered, free, to 15 µm long); true columella absent, but columella-like structures sometimes present in fused ascomata. Epihymenium hyaline, sometimes brownish marginally, with pale greyish brown granules. Asci 8-spored; tholus thin. Ascospores submuriform, subglobose to ellipsoidal or fusiform, with ±rounded to subacute ends, brown, non-amyloid or very faintly amyloid, 12–25 × 8–12 µm, with 4–6 × 1–3 locules; locules ±rounded to angular, usually irregular; septa thin, usually irregular, ascospores often with a more distinct central septum; ascospore wall thick, non-halonate; endospore thick. Pycnidia immersed or in ±globose warts, with a brownish to ±black pore. Conidia bacilliform to oblong-fusiform, to c. 6 (–10) × 1 µm.
CHEMISTRY: Thallus K–, C–, P–; no secondary substances detectable by TLC.
  Rare on bark in lowland monsoon forest in northern N.T.; pantropical.  
  Mangold et al. (2009)  

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

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