Omphalia caesioatra Speg., An. Mus. Nac.

Honan, Amy H., Desjardin, Dennis E., Perry, Brian A., Horak, Egon & Baroni, Timothy J., 2015, Towards a better understanding of Tetrapyrgos (Basidiomycota, Agaricales): new species, type studies, and phylogenetic inferences, Phytotaxa 231 (2), pp. 101-132 : 130

publication ID

https://doi.org/ 10.11646/phytotaxa.231.2.1

persistent identifier

https://treatment.plazi.org/id/5C2387A2-FFDC-FFFA-FF44-FE6BFAA0FB86

treatment provided by

Felipe

scientific name

Omphalia caesioatra Speg., An. Mus. Nac.
status

 

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.

Kingdom

Fungi

Phylum

Basidiomycota

Class

Agaricomycetes

Order

Agaricales

Family

Tricholomataceae

Genus

Omphalia

Loc

Omphalia caesioatra Speg., An. Mus. Nac.

Honan, Amy H., Desjardin, Dennis E., Perry, Brian A., Horak, Egon & Baroni, Timothy J. 2015
2015
Loc

Marasmiellus caesioater (Speg.)

Singer 1953: 9
1953
Loc

Omphalia caesioatra

Speg. 1898: 107
1898
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