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Page number:40 
Remarks (internal):This is the only species in the Gloeocystidiellaceae to have heavily incrusted, thick-walled cystidia. The fungus is not common in northern Europe (Eriksson and Ryvarden, 1975), where it is typically on Picea and Pinus but collected also on Betula, Populus, and Salix. The New Mexico report (Gilbertson et al. 1975) is not included, because it was based on Burdsall's 1346 which is, to us, G. porosum. The Arizona report (Gilbertson and Budington 1970) was based on Budington's 1276 and Gilbertson's 6955. We refer 1276 to Conferticium ravum, but have not seen 6955. These two collections would seem to be the basis for the inclusion of G. convolvens in the Arizona checklist (Gilbertson et aL 1974) and in Lindsey and Gilbertson's (1978) book on decay fungi of aspen. Although the latter cite two voucher specimens (Burdsall 1999 and 4261) under G. convolvens neither is on aspen nor from Arizona. 
Description type:Non-original description 
Description:Gloeocystidiellum convolvens (P. Karst.) Donk Fig. 8 Fungus 26: 9, 1956.
? Corticium convolvens P. Karst., Bidrag. Kännedom Finlands Natur Folk. 37: 148, 1882.
? Peniophora convolvens (P. Karst.) Höhn. & Litsch., Sitzungsber. Kaiserl. Akad. Wiss., Math.-Naturiwss. Cl. 115: 1551, 1906.
? Gloeocystidium convolvens (P. Karst.) Bourdot & Galzin, Bull. Soc. Mycol. France 28: 356, 1913.
= Peniophora lundellii Litsch., Svensk Bot. Tidskr. 32: 288, 1938 and Lundell and Nannfeldt, Fungi Exs. Suec. no. 573, nom. nud., 1938.
Type specimen examined Corticium convolvens, Finland: Tavastia australis, Tammela, Mustiala, x.1873, P.A. Karsten 1360, annot. Litschauer, 1906 (here designated lectotype H).
Basidiomes effuse, 100-500 µm thick, membranous to ceraceous, the hymenial surface smooth to tuberculate, not cracked or extensively fissured, appearing pilose under a lens due to numerous projecting cystidia, "Light Buff' to "Cream Color", "Light Ochraceous-Buff" or "Ochraceous Buff" when dry; margin pruinose to fimbriate, white or concolorous.
Hyphal system monomitic. Hyphae usually loosely arranged next to substrate, distinct, parallel, in a layer from 20-50 µm thick, lacking clamp connections, 2.0-4.0 µm diam, the walls thin to slightly thickened, nonamyloid; subhymenial hyphae compact, distinct to indistinct. Gloeocystidia 70-150 x 7-14 µm, numerous, fusoid to cylindric, and with a ventricose base and a rounded acuminate tip, thin-walled, the contents hyaline to yellowish in KOH under bright field, more or less homogeneous, sulfo-positive. Cystidia (lamprocystidia) numerous, conical, 30.0-65.0 x 7.0-10.5 µm, heavily incrusted, thick-walled, imbedded or projecting to 20 µm, arising throughout the thickness of the subhymenium. Basidia 22.0-40.0 x 3.5-5.0 µm, clavate, lacking a basal clamp connection, with four sterigmata, each up to 5.0 µm long. Basidiospores 5.2-6.0 (-6.8) x (3.6-) 4.0-4.4 µm, ellipsoid to broadly ellipsoid, usually flattened adaxially, the wall verrucose to spiny, amyloid, thin, with a small apiculus.
Ecology and distribution In North America on decorticated wood in an advanced state of decay of a variety of angiopsperms.
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