Arrasia rostrata
Arrasia rostrata Bernicchia, Gorjón & Nakasone 2011, in Bernicchia et al., Mycotaxon, 118(1), 257-264 (2012).
Etymology: the name rostrata refers to the long refractive rostrum on the basidiospores.
Diagnosis: Basidiomata resupinate, effuse, small, circular to linear patches, becoming confluent, up to 30 × 5 mm, thin, up to 180 μm thick, soft, white, smooth, initially finely farinaceous to subfelty, finally thickly farinaceous; margin abrupt, distinct. Hyphal system monomitic with clamped generative hyphae. Subiculum thin, a dense tissue of hyphae and crystals; subicular hyphae 1.8–2.3 μm in diam., clamped, moderately branched, walls hyaline, thin, encrusted with hyaline crystals. Subhymenium not observed. Hymenium a palisade of dendrohyphidia, basidia, and indistinct, collapsed hymenial elements obscured by crystals. Dendrohyphidia filamentous, irregular, with short branches near apex, 40–62 × 1.5–2 μm, clamped at base, walls hyaline, thin. Cystidia absent. Basidia obclavate to suburniform at first, then flexuous, narrowly clavate to obclavate, occasionally with a lateral lobe near base, 50–90 × 10–16 μm, clamped at base, containing resinous globules, often lower part collapsed below a secondary septum, walls hyaline, thin, smooth, (2–)4-sterigmate, sterigmata stout, up to 29 × 5 μm. Basidiospores broadly subfusiform to bi-apiculate, initially distal end obtuse, later developing an extended, thick-walled, refractive rostrum or beak, 27–40 × 10–15 μm, rostrum 8–14 × 1.2–2 μm long, with a distinct, refractive, thick-walled apiculus, containing resinous material, walls hyaline, with distinct walls to slightly thick-walled, smooth, cyanophilous, not reacting in Melzer’s reagent.
Index Fungorum Number: IF561761
Figure 1. Echinodontium ryvardenii (center) surrounded by circular to linear patches of Arrasia rostrata (Bernicchia 8087, holotype). Scale bar = 5 cm.
Figure 2. Arrasia rostrata. Hymenial elements (Bernicchia 8087, holotype). a) immature basidiospores, b) basidia, c) generative hyphae, d) dendrohyphidia
Figure 3. Arrasia rostrata. Basidia and immature basidiospores. (Bernicchia 8087, holotype)
Figure 4. Arrasia rostrata. Mature basidiospores with a well-developed rostrum and immature (right and center right) basidiospores. (1: Bernicchia 8087, holotype; 2: Bernicchia 8074; 3: Bernicchia 8071).
Reference:
Bernicchia, A., Gorjón, S. P., & Nakasone, K. K. (2012). Arrasia rostrata (Basidiomycota), a new corticioid genus and species from Italy. Mycotaxon, 118(1), 257-264.
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