Parmotrema praesorediosum (Nyl.) Hale

Data Set Maintenance: Data set standard item. Data set author(s): Nash T.H. Data set reviewer(s): Nash T.H.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Parmotrema. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Type: Parmelia praesorediosa Nyl.

Taxonomic Literature: Nylander 1891 Hale 1965.

Biogeography: Subtropical and pantropical; colline, submontane, and montane. Continent: Africa, Northern America, Southern America, Pacific, and Asia-Tropical. Checklist records: Guianas, Mexico, Sonoran Desert, United States and Canada (continental), and Venezuela.

Ecology: Biotroph; lichenized; corticolous; substrate non-calciferous.

Thallus: Foliose, subdivided into main parts, and secondary or without secondary parts, sub irregular, continuous throughout, lobed; lobes horizontal; plane; branches applanate (moderately flattened); bifacial; not segmented; separate thallus parts 5-6.5-8 mm wide. Thallus Size and Differentiation: 5-7.5-10 cm in diameter; main branches basally not constricted; apex rounded. Upper Surface: Grey, matt, smooth; not fissurate; not foveate; not convoluted; immaculate; without patches; epruinose; not pseudocyphellate; not wrinkled; eciliate; without hairs; not isidate; without isidiomorphs; not papillate, not pustulate; sorediate; soralia white, laminal or subperipheral, capitate, isolated, not confluent with other soralia, soredia farinose; not tuberculate; not lobulate. Lower Surface: Present, black, black in the centre, brown along the margin; attached by holdfasts; not cyphellate; not wrinkled; rhizinate; rhizines sparse, with a broad non-rhizinate margin, black, not branched; not tuberculate.

Hydrochasic Thallus Movement: Not performing hygrochasic thallus movement.

Upper Cortex: Double-layered.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, forming all across the thallus surface, all across the surface, sparse, 2-6-10 mm in diam.. Margin: Epruinose; sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not ciliate; not hirsute. Disk: Brown. Hymenium: 70-75-80 µm high.

Asci: Dehiscence lecanoralean.

Ascospores: c. 8 per ascus, ellipsoid, 15-18-21 µm long, 7-8.5-10 µm wide.

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Present; only in the upper part of the cortex, throughout the cortex, or throughout the thallus medulla, atranorin or caperatic acid, metabolite(s) of unresolved identity: absent.

Spot Tests: Cortex: KC + deep yellow; medulla: K –, C –, KC –, PD –.

(report generated 04.Okt.2007)