Department of the Environment and Water Resources home page

About us | Contact us | Publications | What's new

Header imagesHeader imagesHeader images

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
Strigula elixii P.M.McCarthy
  Biblioth. Lichenol. 78: 279 (2001). T: Christmas Is., 2 km SSW of airport, off North–South Baseline Road, disused forest track, 10°28.23'S, 105°40.83'E, alt. 240–250 m, on limestone outcrop in moderately dense primary forest, 31.vii.2000, P.M.McCarthy 1438; holo: CANB.  
  Thallus crustose, endolithic, diffuse to ± determinate, continuous, greenish white, pale grey or pale grey-green. Algae Trentepohlia; cells 6–14 × 6–12 µm; interstitial hyphae c. 2 µm wide. Prothallus not apparent. Perithecia numerous, usually solitary, mostly semi-immersed, occasionally almost superficial, convex, broadly conical to hemispherical, rarely slightly constricted at the base, black, (0.27–) 0.41 (–0.52) mm diam.; surface smooth to minutely and irregularly uneven, at first appearing pruinose due to rock fragments and crystals embedded in the involucrellum; decayed perithecia often leaving a shallow depression in the substratum which may be delimited by the black ring of the involucrellar remains. Perithecial apex rounded or somewhat pointed; ostiole usually in a minute, shallow depression or a short, blunt, apical papilla. Involucrellum dimidiate or extending to excipulum-base level, contiguous with the excipulum or diverging near the base, 50–90 µm thick. Excipulum dark greenish brown to black, 20–25 µm thick. Centrum globose to depressed-ovate, 0.2–0.29 mm wide. Subhymenium 10–20 µm thick. Paraphyses simple to sparingly branched, to 1 µm thick. Periphyses absent. Asci elongate-cylindrical, 80–115 × 7–9 µm; apex rounded, non-amyloid, with a 1–2 µm wide and tall, hemispherical to tuberculate ocular chamber. Ascospores usually 8 per ascus (occasionally up to 4 aborting), hyaline, narrowly ellipsoid, fusiform or narrowly clavate, 1-septate, uniseriate and obliquely overlapping to subbiseriate, (11–) 16 (–20) × (3.5–) 4.5 (–6) µm ; contents frequently large-guttulate, the ascospores then sometimes appearing 3-septate. Conidiomata of two types: (1) semi-immersed to almost completely immersed, 0.12–0.17 mm diam., black and convex to subconical above, dark brown to black below; macroconidia 1-septate, cylindrical, 8–12 × 2–3 µm with apiculate to filiform, apical, gelatinous appendages to 2 (–5) µm long; (2) similar in size and structure to macroconidiomata, but with simple, elongate-ellipsoid to bacilliform microconidia 2–4 × 0.7–1 µm.
  Grows on limestone outcrops and large boulders in primary rainforest in Christmas Is.; endemic.  
  McCarthy (2001i)  

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

This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Australian Biological Resources Study. Requests and inquiries concerning reproduction and rights should be addressed in the first instance to Dr P. McCarthy. These pages may not be displayed on, or downloaded to, any other server without the express permission of ABRS.

Top | About us | Advanced search | Contact us | Information services | Publications | Site index | What's new