Entoloma niveum G. Stev. 1962
Details
Details
Entoloma niveum G. Stev., Kew Bull. 16 227 (1962)
Nomenclature
G. Stev.
G. Stev.
1962
227
ICN
Entoloma niveum G. Stev. 1962
NZ holotype (K, Stevenson 642)
species
Entoloma niveum
Classification
Descriptions
Entoloma niveum G. Stev. 1962
Holotype (K): 'Johnson's Hill, Wellington, N.Z.; leg. Stevenson 642, 12.VI.1949'. - Herb. HK. ZT 68/124 (PDD 27023): 'Nelson Creek, Kopara, Ngahere, Prov. Westcoast, N.Z.; leg. Horak. 10.111.1968'. Herb. HK. ZT 69/30: ‘Matakitaki, S of Murchison, Prov. Nelson, N.Z., leg. Horak, 28.1.1969'.
Pileus 10-30 mm diam., hemispherical or convex at first, becoming conical, aged carpophores mostly plane with pronounced papilla at the centre, white turning pink or pink-beige, very densely covered by radial, white fibrils, forming a felt-like weft or sometimes also with fine squamules, membranous, striate near the margin, dry. Lamellae (L 8-14, l 3) adnate to adnexed, occasionally emarginate, white becoming deep pink, gill edge white and fimbriate. Stipe 10-40 x 1-3 mm, cylindrical, often bent, white or hyaline, densely covered by white, silky fibrils, apically also pruinose (in young specimens), dry, hollow, fragile. Context white. Taste and odor strongly farinaceous.
Spores 8-10 x 6-8.5 µm, 5-sided. Basidia 30-35 x 8-10 µm, 4-spored. Cheilocystidia 35-60 x 7-12 µm, capitate-fusoid, sometimes even lecythiform, often irregularly constricted, membrane thin-walled and hyaline. Pleuro- and caulocystidia none. Cuticle a cutis of repent, cylindrical hyphae (6-9 µm diam.), membrane not gelatinized, pigment lacking or encrusting. Clamp connections absent, or very scanty.
Spores 8-10 x 6-8.5 µm, 5-sided. Basidia 30-35 x 8-10 µm, 4-spored. Cheilocystidia 35-60 x 7-12 µm, capitate-fusoid, sometimes even lecythiform, often irregularly constricted, membrane thin-walled and hyaline. Pleuro- and caulocystidia none. Cuticle a cutis of repent, cylindrical hyphae (6-9 µm diam.), membrane not gelatinized, pigment lacking or encrusting. Clamp connections absent, or very scanty.
On rotten wood or sawdust of Nothofagus spp., Dacrydium cupressinum or Podocarpus spp. New Zealand.
Stevenson 1962: 1.c.
E. niveum is closely related to E. albidum Hesler which differs in several minor characters only. According to Hesler the North American species does not grow on rotten wood but on soil.
The relationship of E. niveum with E. pluteoides Hk. is obvious but the two species can be easily separated by the following characters: colour and structure of the cuticle, attachment of the lamellae, presence or absence of cystidia and localization of the pigment.
The relationship of E. niveum with E. pluteoides Hk. is obvious but the two species can be easily separated by the following characters: colour and structure of the cuticle, attachment of the lamellae, presence or absence of cystidia and localization of the pigment.
Entoloma niveum G. Stev. 1962
[Notes from Kew Type specimen, PRJ 2010] Kew images.
Entoloma niveum G. Stev. 1962
Pileus 2-4 cm. diam., snow-white, hemispherical at first, then becoming plane, covered with a fine, felt like weft; flesh creamy-white. Gills adnexed, moderately crowded, creamy becoming stained pale-pink. Stipe 3-4 cm. x 4 mm., white, with ochraceous tinge at base, silky-striate, more or less equal, solid, creamy coloured flesh continuous with that of cap. Spores strongly angled, overall shape rather cuboid, 7 x 10-11um; print dark-pink; no cystidia.
rooting in soil among litter, Johnson's Hill, Wellington, 12.9.1949, Stevenson.
Pileus 2-4 cm. diam., niveus, ex hemisphaerico explanatus, tela tomentosa delicatula vestitus; caro cremeo-albida. Lamellae adnexae, subconfertae, cremeae, dein pallide roseo-tinctae. Stipes 3-4 cm. x 4 mm., albus, basi ochraceo-tinctus, sericeo-striatus, subaequalis, solidus, carne cremea et cum carne pilei continua. S'orae 7 x 10-11um, valde angulatae, prope cubicae, in cumulo obscure roseae. Cystidia nulla.
Stevenson 642.
Taxonomic concepts
Entoloma niveum G. Stev. 1962
Entoloma niveum G. Stev.
Entoloma niveum G. Stev. 1962
Entoloma niveum G. Stev. (1962)
Entoloma niveum G. Stev. 1962
Entoloma niveum G. Stev. (1962)
Global name resources
Collections
Identification keys
Notes
taxonomic status
Horak2008 under E. captiosum says "As pointed out in Horak (1983) the type material of Entoloma niveum is in poor condition. As the result of a critical re-examination of the authentic specimens it could be demonstrated that the type material consists of a mixed collection. Accordingly, it was necessary to propose a new name and upgraded description for this rather common New Zealand taxon." Horak clearly considers the type collection of E. niveum to contain both E. captiosum and E. sericellum and rejects the name E. niveum. The cited Horak 1983 (Mycogeography in the South Pacific region: Agaricales, Boletales) does not include any discussion of E. niveum and the 1980 and 1973 monographs make no mention of the type condition. In addition, Horak 2008 includes the type collection of E. niveum under synonymy with E. sericellum. Noordeloos 2010 (The Entolomataceae of Tasmania) also mentions a study of the type collection and clearly refers to the component now named E. captiosum. I simples solution is to consider E. niveum a nomenclatural synonym of E. sericellum [JAC]
Metadata
1cb18945-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2000
3 December 2022
