Lecanographa subdryophila (Follmann & Vezda) Egea & Torrente

Data Set Maintenance: Data set authentic and standard item. Data set author(s): Egea J. M. & Torrente P. (00-03-22). Data set not to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Lecanographa. Synonyms: Lecanactis subdryophila Follmann & Vezda; genus of unknown placement (incertae sedis) (Roccellaceae Chevall. 1826); Arthoniales.

Taxonomic Literature: Egea J. M. & Torrente P., Bibliohteca Lichenologica 54: 1-205 (1994); Follmann G. & Vezda A., Philippia 3: 271-277 (1977).

Biogeography: Continent: Northern America and Southern America. Checklist records: Sonoran Desert.

Ecology: Biotroph; lichenized; corticolous; episubstratic; growing partially shaded or fully shaded; under conditions which are dry.

Lichen Photobionts: Primary photobiont present; trentepohlioid.

Thallus: Crustose, rimose or areolate (primarily areolate); separate thallus parts thick. Thallus Outline: Persistent; pronounced, but not forming cushions. Upper Surface: Pale grey or brownish yellow, smooth, pulverulaceous; special structures absent; epruinose; without hairs; not sorediate; soralia isolated, not confluent with other soralia.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, orbicular or less often irregular, forming independently from the host thallus or mycelium, soon sessile, slightly constricted at the base, abundant, .3-1 mm in diam.. Margin: Smooth, excluded, distinct or indistinct, black or dark brown, slightly pruinose; with surface structures surface structures; external filaments absent. Disk: Plane to slightly weakly convex; black or dark brown; fully exposed, pruinose, pruina scarce or abundant, white or pale grey. Exciple: Hyphae not easily discerned; carbonized; brownish red; inspersed with crystals. Amphithecium (thalline excipulum): Photobiont absent. Episamma: With episamma; insoluble in KOH. Epithecium: With epithecium; apical cells slightly swollen, surrounded by a diffuse pigment, dark brown. Hymenium: 100-110 µm high; white; iodine reaction: Lugol’s positive; hemiamyloid. Interascal Hyphae: Present, distinctly branched, distinctly anastomosed; cells 1.5 µm wide. Subhymenium: 20-30 µm high; brownish red or pale brown. Hypothecium: Brownish red; pigment homogenously distributed throughout or not homogenously distributed.

Asci: Clavate or narrowly clavate; indistinctly stipitate, 45-70 µm long, 10-13 µm wide; tholus thickened, amyloid, hemiamyloid, in Lugol's Solution + light blue, with amyloid tube; dehiscence bitunicate; endoascus with a hemiamyloid inner layer.

Ascospores: c. 8 per ascus, fusiform, 15-24-(27) µm long, 3-3.5-(4) µm wide, aciculate; septa present; (4)-5-6-(7)-transversally septate; lumina apically and basally tapering; wall thin, becoming pigmented, hyaline or pale brown, not ornamented, distinctly halonate, i.e., with a thick mucilaginous sheath.

Conidiomata: Present; pycnidial; moderately abundant; immersed.

Pycnidia: Subglobular. Conidia: Bacilliform or curved; microconidial; 5-8-(9) µm long; 1-1.2 µm wide; aseptate.

Secondary Metabolites: Present; 2'-O-demethylpsoromic acid or psoromic acid.

Spot Tests: Present reactions. Upper surface: K – (negative) or + deep yellow, C –, KC –, PD + orange; ascocarp margin (in section): K + green.

(report generated 25.Okt.2007)