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Pleurocollybia cremea (G. Stev.) E. Horak 1971

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Pleurocollybia cremea (G. Stev.) E. Horak, New Zealand J. Bot. 9 415 (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971

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Endemic
Present
New Zealand
Political Region

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(G. Stev.) E. Horak
G. Stev.
E. Horak
1971
415
ICN
NZ holotype
species
Pleurocollybia cremea

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[GS] Pileus 1.5-3.5 cm diam., creamy white to deep cream, orbicular to reniform, convex becoming depressed, margin down-rolled, matt to almost velvety; flesh white, firm, continuous with that of stipe. Gills adnexed to sinuate, creamy white, thin, crowded, margins lacerate. Stipe 1-2 x 0.2- 0.3 cm, excentric to lateral, creamy, fibrillose to velutinate, tapered downwards, swollen at base, tough, solid. Spores 3.5 x 2.5 μm, faintly amyloid (Fig. 42). Hymenophoral trama of broad hyphae, some 10 μm diam., thinwalled. Cuticle of closely woven thin-walled hyphae, 2-3 μm diam. [EH] It is difficult to comprehend why Stevenson placed this fungus, which is common in the New Zealand bush, in Lentinellus. All characters indicate an obvious relationship with Pleurocollybia, a genus not previously known from New Zealand. Spores roundish, hyaline, weakly amyloid, smooth, 2.5-3 X 2.5 um. [Miller] The type (K) has small, nonamyloid, subglobose, smooth spores 3.5 x 2.5 um. Basidia 13-15 x 3.5-4.0 um. clavate, 4-spored. thin-walled. The trama is nonamyloid, thin-walled and quite broad. [JAC] Cap hyphae glassy walled with nodulose excrescences, unclamped. No cystidia. Spores possibly briefly and faintly amyloid. Including apiculus length=4.2–5.0µm (µ=4.6, σ=0.26), width=3.0–4.0µm (µ=3.4, σ=0.23), Q=1.2–1.6µm (µ=1.38, σ=0.10), n=20. Does not posess siderophilous granules of either macro or oligo type. This does not have the spores of the similar Clitocybe albida which has ovoid spores and filiform cystidia on at least some gill, but also has obvious clamps and decurrent gills. The lack of clamps in this specimen is puzzling. Recent material identified as P. cremea is within the Lyophyllaceae and is an Ossicaulis sister to Ossicaulis lignatilis, and O. lachnopus and is a brown rotter. These characters fit with this type. However that recent material also shows siderophilous granules and clamps. The absence of granules and clamps leads me to conclude this is not the same as recent material under that name (which can now be found under Ossicaulis). It is worth noting the gills most certainly have a lacerate edge which is probably why Stevenson placed it in Lentinellus

Pleurocollybia cremea (G. Stev.) E. Horak 1971

Lentinellus cremeus Stevenson (29 D) Fig. 5 = Pleurocollybia cremea (Stevenson) comb. nov. (Basionym: L. cremeus Stevenson, Kew Bull. 19: 21, 1964)

It is difficult to comprehend why Stevenson placed this fungus, which is common in the New Zealand bush, in Lentinellus. All characters indicate an obvious relationship with Pleurocollybia, a genus not previously known from New Zealand. Spores roundish, hyaline, weakly amyloid, smooth, 2.5-3 X 2.5 µ.

Pleurocollybia cremea (G. Stev.) E. Horak 1971

=Omphalina cremea (G.Stev.) O.K.Mill. & L.Stewart, Mycologia 63: 366, 1971, an illegitimate combination, a later homonym of Omphalina cremea Murrill, N. American Flora 9: 350, 1916.
Pileus 1.5-3.5 cm diam., creamy white to deep cream, orbicular to reniform, convex becoming depressed, margin down-rolled, matt to almost velvety; flesh white, firm, continuous with that of stipe. Gills adnexed to sinuate, creamy white, thin, crowded, margins lacerate. Stipe 1-2 x 0.2-0.3 cm, excentric to lateral, creamy, fibrillose to velutinate, tapered downwards, swollen at base, tough, solid. Spores 3.5 x 2.5 µm, faintly amyloid (Fig. 42). Hymenophoral trama of broad hyphae, some 10 µm diam., thin-walled. Cuticle of closely woven thin-walled hyphae, 2-3 µm diam.
On fallen wood, Tararuas, Levin, 18.6.1949) Stevenson (type).
Pileus l.5-3.5 cm diam., cremeo-albus usque intense cremeus, orbicularis usque reniformis, convexus deinde depressus, margine deorsum involute, laevis usque fere velutinus; caro albida, firma, cum stipite continua. Lamellae adnexae usque sinuatae, cremeo-albae, tenues, confertae, marginibus laceratis. Stipes 1-2 x 0.2-0.3 cm, excentricus usque lateralis, cremeus, fibrillosus usque velutinosus, deorsum attenuatus, basi tumidus, tenax, solidus. Sporae 3.5 x 2.5 µm, levissime amyloideae, Trama hymenophoralis ex hyphis latis nonnunquam 10 µm diam. sistens, parietibus tenuibus. Cuticula ex hyphis dense intertextis 2-3 µm diam. sistens, parietibus tenuibus.
Typus: Stevenson 667.

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Lentinellus cremeus G. Stev. (1964)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Omphalina cremea (G. Stev.) O.K. Mill. (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971
Pleurocollybia cremea (G. Stev.) E. Horak (1971)
Pleurocollybia cremea (G. Stev.) E. Horak 1971

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Pleurocollybia cremea (G. Stev.) E. Horak 1971
New Zealand
Auckland
Pleurocollybia cremea (G. Stev.) E. Horak 1971
New Zealand
Kaikoura
Pleurocollybia cremea (G. Stev.) E. Horak 1971
New Zealand
Rangitikei
Pleurocollybia cremea (G. Stev.) E. Horak 1971
New Zealand
Wanganui
Pleurocollybia cremea (G. Stev.) E. Horak 1971
New Zealand
Westland

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taxonomic status
The type collection does not have clamps and fits the generic concept of Pleurocollybia. A number of other collections under this name are clamped and represent an undescribed Ossicaulis sp. P. cremea requires a recombination in Callistosporium.[JAC 2015]

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1cb19bfa-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2000
15 December 2003
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