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Cetraria obtusata (Schaer.) van den Boom & Sipman

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Thell A. Data set not revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Cetraria obtusata v. d. Boom & Sipman. Cetraria. Synonyms: Cornicularia aculeata f. obtusata (Schaerer) Rabenhorst
aculeata var. stuppea f. obtusata (Schaerer) Flotow
tenuissima (L.) Vain. f. obtusata (Schaerer) Dalla Torre &
Parmeliaceae Zenker (1827); Lecanorales.

Type Information: Basionym: Cetraria aculeata f. obtusata Schaerer. Type: Cetraria obtusata.

Taxonomic Literature: Taxonomic notes: This species is presumably not a member of the genus Cetraria in a
strict sense.
Kärnefelt, I. 1986: The genera Bryocaulon, Coelocaulon and
Cornicularia and formerly associated taxa. Opera Botanica 86: 1-
Boom, P. P. G. v. d. 1993: Cetraria obtusata comb. et stat nov.,
an overlooked lichen species from the central Alps. Lichenologist 26
(2): 105-112.

Biogeography: Northern hemispheric; alpine. Continent: Europe. Checklist records: Austria (Switzerland) and Italy.

Ecology: Biotroph; lichenized; terricolous.

Thallus: Fruticose; erect; branches unifacial; not segmented. Secondary Thallus: Trunk brown, concolorous the branches. Thallus Size and Differentiation: (1)-(2) cm long. Thallus Outline: Irregular; white. Upper Surface: Brown, glossy (shiny), smooth; not fissurate; not foveate; not convoluted; immaculate; without patches; epruinose; pseudocyphellate; pseudocyphellae isolated, distributed all over the surface, prominent, central or laminal, orbicular (0.1 - 0.2 mm), warts (raised on warts); not wrinkled; ciliate; cilia slender (1 mm long, 0.1 mm thick), laminal (scattered); without hairs; not isidate; without isidiomorphs; not papillate, not pustulate; not sorediate; not tuberculate or tuberculate; tubercles small; not lobulate. Lower Surface: Absent; not attached, thallus vagrant.

Hydrochasic Thallus Movement: Not performing hygrochasic thallus movement.

Upper Cortex: Double-layered; epicortex non-porous (i.e., forming a syncortex). Photobiont Layer: Photobiont cells scattered. Medulla: Single-layered, very loose, becoming hollow; hyphae without particular orientation.

Reproduction Strategy: Only known as sterile, asexually reproducing form.

Conidiomata: Present; formed on projections, all accross the thallus surface (scattered); supporting structure: absent, scattered all accross the thallus surface.

Conidia: Sublageniform; 6-7 µm long; 1-1.5 µm wide.

Secondary Metabolites: Present; throughout the cortex or throughout the thallus medulla, protolichesterinic acid, of the following substance class(es): (higher) aliphatic acids and (anthra-)quinones, metabolite(s) of unresolved identity: present.

Spot Tests: Medulla: K –, KC –, PD –.

(report generated 04.Okt.2007)

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