Entoloma dennisii

Karstedt, Fernanda, Bergemann, Sarah E., Gates, Genevieve, Ratkowsky, David, Cunha, Kelmer Martins & Capelari, Marina, 2024, Species of Entoloma (Entolomataceae) with cuboidal basidiospores from Brazil, Phytotaxa 654 (1), pp. 1-76 : 31

Entoloma dennisii E. Horak, Sydowia 28: 183. 1976 [1975].

[≡ Inopilus dennisii (E. Horak) Pegler, Kew Bull., Addit. Ser. 9: 349. 1983; ≡ Inocephalus dennisii (E. Horak) Karstedt & Capelari, Nova Hedwigia 96: 289. 2013].

Fig. 33d

Description:—The morphological description of this species appears in Karstedt & Capelari (2013).

Habitat:—Solitary, in soil next to a bamboo plantation, in the Atlantic Forest biome.

Distribution:—Originally described from Trinidad ( Dennis 1953) and reported from the city of São Paulo, Brazil ( Karstedt & Capelari 2013).

Additional material examined:— BRAZIL. São Paulo: São Paulo, Fontes do Ipiranga State Park, Botanical Garden , 1 March 2004, C. Puccinelli et al. CP47/04 (SP) . TRINIDAD. St. Joseph: 10 October 1947, R. E.D. Baker 1714 (Holotype, K); River Estate Diego Martin, Maqueripe Trail , 27 October 1949, R. W.G. Dennis 242 (K) .

Comments:— Entoloma dennisii is characterized by a pale yellow tricholomatoid basidiome,cuboidal basidiospores, clavate, branched and septate cheilocystidia and a cutis-type pileipellis. Phylogenetically ( Fig. 3 ), E. dennisii is related to other species that have cuboidal basidiospores without elongated angles.

This species was reported as occurring in the Ilha do Cardoso State Park ( Capelari 1989, as Inopilus cf. dennisii ). Upon reviewing the material, it was found that it was composed of a single basidiome degraded by insects and when analyzed under the microscope it was only possible to recognize a few cuboidal basidiospores, with angles scarcely elongated, measuring 8.7–10 × 8.7–11 µm in the depressions and 10–11.2 × 11–11.2 µm at the projections. From these basidiospore characteristics, it appears that the material labelled ‘ M. Capelari 229 ’ does not correspond to Entoloma dennisii , since the latter has perfectly cuboidal basidiospores, without depressions, besides being smaller, 6.2-7.5(8.7) × 6.2–7.5 µm ( Karstedt & Capelari 2013).

Figures

FIGURE 3. Phylogenetic reconstruction of the species of Entolomataceae with cuboid basidiospores and related species based on the combined genes (nLSU, mtSSU, rpb2 and tef1). Bootstrap values (> 70%) from the maximum likelihood analysis are indicated above the branches. The species studied here are shown in boldface. AU: Australia, AT: Austria, BZ: Belize, BR: Brazil, CN: China, GY: Guyana, IN: India, MY: Malaysia, NZ: New Zealand, PG: Papua New Guinea, PR: Puerto Rico, RE: La Reunion, UK: Russia, SC: Seychelles, US: United States, VN: Vietnam. Dashed vertical line: have similarity in the morphology but no molecular support.

FIGURE 33. Basidiomas:a–b. Entoloma acutipallidum: a. FK1893; b. 11RMT078; c. E. caxiuanense (FK1871); d. E. dennisii (CP47/04); e–g. E. luteolamellatum: e. 11RMT094; f–g. 11RMT109; h. E. capes (FK2096). Photos: a, c, h: F. Karstedt; b, e–g: R. Mazieiro; d: C. Puccinelli. Scale: 1 cm.