Pamotrema dilitatum (Vain.) 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 or basionymous. Taxonomic rank: species. Parmotrema. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Type: Parmelia dilatata Vain.

Taxonomic Literature: Vainio 1890 Hale 1965.

Biogeography: Pantropical; submontane and montane. Continent: Africa, Australasia, Northern America, Southern America, and Asia-Tropical. Checklist records: Australia, Bolivia, Mexico, Sonoran Desert, United States and Canada (continental), and Venezuela.

Ecology: Biotroph; lichenized; corticolous.

Thallus: Foliose, subdivided into main parts, and secondary parts, sub irregular, continuous throughout, lobed; lobes elongate, horizontal; plane; branches applanate (moderately flattened); bifacial; not segmented; separate thallus parts 10-12.5-15 mm wide. Thallus Size and Differentiation: 10-15-20 cm in diameter; main branches basally not constricted; apex rounded. Upper Surface: Grey, plane, matt or glossy (shiny), smooth; not fissurate; not foveate; not convoluted; faintly maculate; without patches; epruinose; not pseudocyphellate; not wrinkled; eciliate or ciliate; cilia slender; without hairs; not isidate; without isidiomorphs; not papillate, not pustulate; sorediate; soralia white, peripheral, erose or linear, confluent, but not fusing, soredia coarse; not tuberculate; lobulate. Lower Surface: Present, black, black in the centre, brown along the margin; attached by holdfasts; not cyphellate; not wrinkled; rhizines 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, 3-4-5 mm in diam.. Margin: Crenulate, epruinose; not 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, 18-20-22 µm long, 8-9-10 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 protocetraric acid, metabolite(s) of unresolved identity: absent.

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

(report generated 04.Okt.2007)