Leptogium (Ach.) Gray (1821)

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. Data set reviewer(s): Jørgensen P. M. (98-03-20); revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: genus. Number of known taxa within this rank: 160. Leptogium. Collemataceae Zenker (1827); Peltigerineae; Lecanorales.

Type Information: Type: Leptogium lacerum (Sw.) Gray (= L. lichenoides (L.) Zahlbr.).

Taxonomic Literature: Aptroot A., Diederich P., Sérusiaux E. & Sipman H.J.M.,
Biblioth. Lichenol. 64: 1-220 [79-81] (1997); Clauzade G. & Roux
C., Bull. Soc. Bot. Centre-Ouest N.S. - Numero Special 7: 1-893 [493-
499] (1985); Coppins B.J. & Purvis O.W. in: Purvis O.W. et al.
(eds), The Lichen Flora of Great Britain and Ireland, London (1992);
Galloway D.J., Flora of New Zealand Lichens: i-lxxiii, 1-662 [248-
253], Wellington (1985); Galloway D.J. & Jørgensen P.M.
in: Daniels F.J.A., Schulz M. & Peine J. (eds): Flechten
Follmann: 227-247, Cologne (1995); Jørgensen P.M., Herzogia 3:
433-460 (1975); Jørgensen P.M., Lichenologist 26: 1-30 (1994);
Jørgensen P.M., Lichenologist 26: 213-215 (1994);
Jørgensen P.M. in: Tibell L. & Hedberg I. (eds), Symb.
Bot. Upsal. 32: 113-130 (1997); Jørgensen P.M. & Goward
T., Acta Bot. Fenn. 150: 75-78 (1994); Jørgensen P.M. &
James P.W., Lichenologist 15: 109-125 (1983); Lindström M.,
Graphis Scripta 5: 5-7 (1993); Lindström M., Lichenologist 28:
91-94 (1996); Poelt J. & Vezda A., Biblioth. Lichenol. 9: 1-258
[151-155] (1977); Verdon D., Mycotaxon 37: 413-440 (1990), Verdon D.,
Flora Australia 54: 173-192 (1992).

Biogeography: Checklist records: Austria, Bolivia, Germany, Great Britain, Guianas, Italy, New Guinea, New Zealand, Sonoran Desert, Sweden and Norway, Thailand, United States and Canada (continental), and Republic of South Africa.

Ecology: Biotroph; lichenized; terricolous, bryophytic, or corticolous; substrate non-calciferous or calciferous.

Lichen Photobionts: Primary photobiont present; cyanobacterial. Primary photobiont taxonomy: Nostoc (A. Beck 22-05-97); Nostocaceae; Nostocales, Cyanobacteria, Prokaryota. Secondary photobiont absent.

Thallus: Crustose or foliose, not subdivided parts, squamulose, placodioid, subfruticose, or granular, lobed. Thallus Outline: Soon disappearing. Upper Surface: Black, grey, or brown; special structures absent or present:; not pseudocyphellate; eciliate; without hairs or hairy; not isidate or isidiate; not sorediate; not cephalodiate; not lobulate; without granules granules, without thalloconidia thalloconidia. Lower Surface: Attached by the whole lower surface or attached by holdfasts; special structures absent or present:; not pseudocyphellate; not cyphellate; not rhizinate or rhizinate; without thalloconidia thalloconidia; not cavernulate; not tomentose or tomentose.

Reproduction Strategy: Only known as sterile, asexually reproducing form or with sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular, forming all across the thallus surface, soon sessile to stipitate. Margin: Prominent; external filaments absent. Exciple: White. Periphyses: Absent. Epithecium: Apical cells brown, hyaline, or brownish yellow. Hymenium: Iodine reaction: Lugol’s positive. Interascal Hyphae: Present, scarcely branched, not or scarcely anastomosed. Hypothecium: Brownish yellow.

Asci: Tholus thickened, amyloid, with amyloid tube; ocular chamber indistinct; dehiscence lecanoralean; exoascus euamyloid.

Ascospores: c. 4 to c. 8 per ascus, broadly ellipsoid, ellipsoid, fusiform, or ovoid, 15-60 µm long, 5-20 µm wide, obtuse or aciculate; septa present; transversally septate or both transversally and longitudinally, 3-9-(10)-transversally septate; wall thin, not thickened at the septum, hyaline, in Lugol's Solution negative, wall not ornamented.

Conidiomata: Absent resp. not observed or present; pycnidial; immersed, formed all accross the thallus surface or along the thallus periphery.

Conidia: Bacilliform.

Secondary Metabolites: Not detected.

(report generated 04.Okt.2007)