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Phacopsis oxyspora var. fusca Triebel & Rambold

Data Set Maintenance: Data set standard item. Data set author(s): Rambold G. & Triebel D. (94-11-15). Data set reviewer(s): Kainz C. (00-12-22 & 03-06-18); to be published after submission; 94-11-15.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Phacopsis. Parmeliaceae Zenker (1827).

Taxonomic Literature: Triebel D. & Rambold G. 1995. A Conspectus of the Genus Phacopsis
(Lecanorales). The Bryologist 98(1): 71-83; Hafellner et al., Mycotaxon 84: 293-329 (2002).

Biogeography: Continent: Africa, Australasia, Europe, and Northern America (U.S.A., Arizona, Apache Co., Mt. Baldy Wilderness, trail from Phelp's Cabin, adjacent cliffs, mixed conifer forest including large Pseudotsuga menziesii, 33°55'30''N, 109°30'20''W, 2900 m, on Hypotrachyna pulvinata, T.H. Nash III. 34911 (ASU); Mexico, Chihuahua, small secondary valley within Barranca del Cobre, oak-pine-cypress forest, 27°26'20''N, 107°29'20''W, 1800 m, on Hypotrachyna meridiensis, T.H. Nash III. 36932 (ASU)). Checklist records: Sonoran Desert.

Ecology: Biotroph (cecidogenous, on thalli of Cavernularia, Hypogymnia, Parmelinopsis, Parmotrema, Pseudevernia, Xanthoparmelia, Hypotrachyna); lichenicolous (cecidogenous, on thalli of Cavernularia, Hypogymnia, Parmelinopsis, Parmotrema, Pseudevernia, Xanthoparmelia, Hypotrachyna).

Thallus: Indistinct (vegetative hyphae colorless, rarely brown, I-).

Medulla: Iodine reaction in Lugol's solution negative.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, forming independently from the host thallus or mycelium (crowded or confluent), not emerging, becoming adnate (becoming erumpent), .15-.25-(.35) mm in diam.. Margin: Indistinct. Disk: Plane to weakly convex, black (mat to shiny) or dark brown. Exciple: Brown (to dark brown, excipulum ca. 20-30(-45) µm thick, composed of more or less isodiametric cells, ca. (3-)5-8(-9) µm diam., lumina ca. (1.5-)2-4 µm (textura angularis)). Epithecium: Apical cells distinctly swollen (paraphyses ca. (1.5-)2-2.5(-3.5) µm thick, lumina ca. 1.5-2(-3) µm, apical cells with small, dark-brown-pigmented caps, ca. 3-5.5 µm thick, lumina 1.5-3 µm); brown (to pale brown, (10-)15-20(-25) µm tall). Hymenium: (45)-50-60-(65) µm high; pale brown or white. Interascal Hyphae: Scarcely branched ('scarcely branched'), not or scarcely anastomosed ('scarcely anastomosed'). Hypothecium: Brown (to dark brown; hypothecium 30-130 µm tall, basally pseudoparenchymatic, lacking euamyloid reaction). Hypothecial Extension: Present.

Asci: Dehiscence lecanoralean ((35-)44-62 x (14-)16-22(-29) µm).

Ascospores: c. 8 per ascus, ellipsoid (to lemon-shaped), (14)-15.5-21-(24.5) µm long, (5)-5.5-6.5-(7) µm wide, aciculate (mostly); septa absent; wall thin, not ornamented.

Conidiomata: Present; immersed.

Pycnidia: Globular (70-90 µm); wall dark brown. Conidia: Bacilliform; 5-6.5 µm long; .5-1 µm wide.

(report generated 04.Okt.2007)

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