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Species MB515207 Dendrothele gilbertsonii Nakasone 2009   Bibliography: Nakasone, K.K., 2009, North American Fungi 4 (7): 4 (more info) Year of publication: 2009 Status of the name: basionym; legitimate MycoBank's opinion: currently used Classification: Fungi, Basidiomycota, Agaricomycotina, Agaricomycetes, Corticiales, Corticiaceae, Dendrothele Obligate synonym(s): none Morphic status: Teleomorph (anamorph connection(s) unknown or not recorded) Taxonomic synonym(s): Ordered by epithet name none Descriptions: Latin diagnosis Basidiomata effusa, usque ad 430 µm crassa, ceracea, laevia vel tuberculata, rimis profundis, luteola vel cinereo-cinnamonea, marginibus abruptis. System hypharum monomiticum fibulatis. Dendrohyphidia 20–45 × 1–4 µm. Gloeocystidia clavata vel cylindrica, aliqundo lobata, 35–50 × 8–12 µm. Basidia clavata vel suburniformia constrictis, 30–50 × 7–12 µm. Basidiosporae late ellipsoidea, 10–12.5 × 8–9.5(–10) µm, tunicis hyalinis, paulo incrassatis, laevibus, cyanophilis. Holotype — UNITED STATES. Arizona, Santa Cruz County, Coronado National Forest, Sycamore Canyon, on bark of Quercus toumeyi Sarg., 24 Sep 1970, R. L. Gilberston 9948, US0285732 (BPI; isotypes ARIZ, CFMR). Original description Basidiomes resupinate, effuse, beginning as small, irregular colonies that coalesce, up to 25 × 10 mm, thin to moderately thick, up to 430 µm thick, adnate but easily separated from substrate, soft to subceraceous; hymenial surface smooth to tuberculate, orange white (5A2), pale orange (5A3), orange grey (5B2), greyish orange [5B(3-4)], yellowish white (4A2), or grayish white; cracks extensive, deep, sometimes forming polygons; margin well-defined, abrupt, adnate, concolorous with hymenial surface with a narrow, white fringed edge. Hyphal system monomitic with clamped generative hyphae. Subiculum a dense, agglutinated tissue with abundant, embedded, hyaline crystals; subicular hyphae 1.5–3.5 µm diam, clamped, moderately branched, walls hyaline, thin to slightly thickened, smooth. Catahymenium a dense, compact tissue composed of embedded crystals, dendrohyphidia, gloeocystidia, and basidia. Dendrohyphidia abundant, filiform, with knobs or short lateral branches at apex, occasionally elaborately branched, 20–45 × 1–4 µm, clamped at base, walls hyaline, thin, smooth, sometimes coated with a brown, mucilaginous material or a thin, hyaline, crystalline sheath. Gloeocystidia clavate to cylindrical, sometimes with a basal lobe, 35–50 × 8–12 µm, tapering to 1.5–3 µm diam at base, with a basal clamp, sometimes with resinous contents, contents not reacting with sulfovanillin, walls hyaline, thin, smooth. Basidia clavate to suburniform, sometimes repetitive, with median constrictions, sometimes stalked, 30–50 × 7–12 µm, clamped at base, walls hyaline, thin, smooth; 4-sterigmate. Basidiospores broadly ellipsoid with a small, distinct apiculus, sometimes adherent, 10–12.5 × 8–9.5(–10) µm, Q = 1.3 (n = 15–20), walls hyaline, slightly thickened, smooth, cyanophilous, not reacting in Melzer’s reagent. Habitat and distribution. Uncommon on bark and wood of Quercus. Known only from the type locality in southern Arizona. Additional specimen examined. UNITED STATES. Arizona, Santa Cruz County, Coronado National Forest, Sycamore Canyon, on bark of Quercus arizonica Sarg., 21 Jan 1975, E. R. Canfield 71-24 (ARIZ). Remarks: Dendrothele gilbertsonii is characterized by small, discrete brownish orange basidiomes, clamped hyphae, gloeocystidia and broadly ellipsoid basidiospores. The morphologically similar species Dendrothele incrustans lacks gloeocystidia, produces globose to subglobose basidiospores and softer, thinner basidiomes (Table 2). Similar broadly ellipsoid basidiospores are found in D. tuberculata Gresl. & Rajchenb., D. andina (Pat.) Nakasone, D. griseocana (Bres.) Bourdot & Galzin and D. commixta; however, in these species the basidia are regularly 2-sterigmate. Other species with similar basidiospores include Dendrothele acerina (Pers.) P.A. Lemke and D. wojewodai Pouzar that develop distinctive cystidia with an apical appendage, whereas D. americana Nakasone and D. tanzaniana Nakasone develop sterile hyphal pegs. The specimens of D. gilbertsonii cited herein were originally reported as Aleurocorticium griseocanum (Bres.) P. A. Lemke (Gilbertson et al. 1972). Date entered: 22/09/2009 08:46:15 Date of release: 19/01/2010 03:13:09 Entered by: Dr. Karen Nakasone Center for Forest Mycology Research, Northern Research Station, Forest Service, United States Department of Agriculture, United States Illustration #1: Description: Author(s): Nakasone Type specimen Description: MBSPEC 50102 Herbarium number: US0285732, ARIZ RLG 9948 Collected by: R.L.Gilbertson Substrate: bark of Quercus toumeyi Sarg. Location: UNITED STATES. Arizona, Santa Cruz County, Coronado National Forest, Sycamore Canyon Scientific data 2 link(s) available Line drawings of microscopic elements click me photograph of basidiome of Dendrothele gilbertsonii click me