Omphalia caesioatra Speg., An. Mus. Nac.
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https://doi.org/ 10.11646/phytotaxa.231.2.1 |
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https://treatment.plazi.org/id/5C2387A2-FFDC-FFFA-FF44-FE6BFAA0FB86 |
treatment provided by |
Felipe |
scientific name |
Omphalia caesioatra Speg., An. Mus. Nac. |
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Omphalia caesioatra Speg., An. Mus. Nac. Buenos Aires 6: 107. 1898
Synonym: Marasmiellus caesioater (Speg.) Singer, Rev. Mycol. View in CoL 18: 9. 1953.
Accepted as a synonym of Tetrapyrgo s nigripes by Horak (1983, 1987).
Holotype:— ARGENTINA. Buenos Aires Prov.: La Plata , on stems and leaves of grass, April 1888, C Spegazzini 46 ( LPS 16794 About LPS !).
The holotype specimen consists of two fragmented basidiomes attached to the base of the stem of a grass, both entirely blackened and in poor condition. Description of dried holotype: Pileus 4 mm diam., convex. Lamellae badly eroded. Stipe 8 × 1 mm, non-insititious. No basidiospores observed; basidiospores reported as 10 × 5 μm, ellipsoid to ovoid ( Spegazzini 1898), or 8–13.8 × 4–6.8 μm, oblong to fusoid-ellipsoid ( Singer1973). Hymenial elements collapsed, not observable. Pileipellis a cutis of non-diverticulate hyphae 3.5–8 μm diam., smooth, with dark brown vacuolar pigments (necropigments?); walls hyaline, thin; no pileocystidia observed. Singer (1950: 188) reported the epicuticular hyphae as diverticulate.
Status: The non-diverticulate pileipellis hyphae in combination with black necropigments and fusoid-ellipsoid basidiospores indicate placement in Marasmiellus sect. Candidi , not in Marasmiellus sect. Tricolores as indicated by Singer (1973: 92), nor is the species a synonym of Tetrapyrgos nigripes as indicated by Horak (1983, 1987). Omphalia caesioater is phenetically similar to Marasmiellus subnigricans (Murr.) Singer , another blackening species.
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Omphalia caesioatra Speg., An. Mus. Nac.
Honan, Amy H., Desjardin, Dennis E., Perry, Brian A., Horak, Egon & Baroni, Timothy J. 2015 |
Marasmiellus caesioater (Speg.)
Singer 1953: 9 |
Omphalia caesioatra
Speg. 1898: 107 |