Persoonia

The agaricoid Hymenomycete Xeromphalina campanella is exocarpic, apertopileate and amphiblemate. Metablemas develop separately on the pileus and on the stipe, but they do not form any kind of veil. The pileoblema becomes a gelatinous pileipellis, and the cauloblema forms a hairy coating on the lower part of the stipe of the mature basidiomes. The hymenophoral trama is bidirectional in the gill rudiments, but becomes more physalo-irregular at maturity and contains many narrow hyphae with smooth or incrusted walls. The context of the stipe resembles a sarcodimitic structure, but the thin-walled inflated cells are rarely fusiform, although they are frequently gradually narrowed at one end. Between the physalohyphae, narrow, incrusted hyphae and ramified connective hyphae occur in the stipe and in the pileus context. The hyphae of the pileus of a young basidiome contain granular deposits of glycogen.

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Revision of Lactarius from Mexico. Additional new records

Leticia Montoya & Victor M. Bandala. Persoonia 18(4): 471-483. 2005.

Three species of Lactarius from Mexico were studied: L. deceptivus, L. luteolus and L. rimosellus. The latter two concern new records from western Mexico and from the Gulf of Mexico region, respectively, and the former was found on new localities. A study of their respective type collections and those of L. tomentosomarginatus and L. echinatus was made in order to support the identity of Mexican specimens. Based on a morphological study we propose reducing L. tomentosomarginatus to synonymy of L. deceptivus and agree with other authors that L. echinatus is conspecific with L. luteolus. Descriptions and illustrations are given of the three Mexican records.

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Revision of type material of nivicolous species of Stemonitales

H. Singer, G. Moreno& C. Illana. Persoonia 18(4): 485-497. 2005.

The types of Comatricha anastomosans Kowalski, C. filamentosa Meyl., C. suksdorfii Ellis & Everh. var. aggregata Meyl. and Lamproderma longifilum H. Neubert, Nowotny & K. Baumann were studied. Comatricha anastomosans is synonymized with C. filamentosa, C. suksdorfii var. aggregata with Symphytocarpus confluens (Cooke & Ellis) Ing & Nann.-Bremek. A new lectotype for C. filamentosa is proposed. The synonymy of L. longifilum with C. anastomosans is confirmed. SEM and light microscope micrographs of spores, capillitia and sporocarps are given.

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New observations on the basidiome ontogeny of Chamonixia caespitosa (sequestrate Boletaceae)

H. Clémençon. Persoonia 18(4): 499-504. 2005.

The description of basidiome development of Chamonixia caespitosa made by Eduard Fischer during the first quarter of the last century is extended, based on a new investigation of the original permanent mounts. This puffball-like fungus is exocarpic, claustropileate and amphicleistoblemate. A hymeniform palisade on the primordial stipe becomes partly covered and obliterated by the pileus margin and an amphicleistoblema. The morphological data confirm the molecular-taxonomic position of Chamonixia in the Boletaceae.

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A new species of Gymnopilus (Cortinariaceae) from sandy soils in Pinus forests

A. Ortega & F. Esteve-Raventós. Persoonia 18(4): 505-510. 2005.

The new species Gymnopilus arenophilus A. Ortega & Esteve-Rav. is described. It is characterized by its particular habitat in sandy, sometimes burned, soils of thermophilous Pinus forests. Macroscopically G. arenophilus resembles G. penetrans, from which it differs in the larger spores and the scarcely bitter taste. Microscopically G. arenophilus reminds of G. fulgens, with which it has probably been mistaken in the past. The latter species has very different macroscopical features, spore ornamentation and a paludicolous habitat. A discussion of European and some non-European related species is also given.

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A revision of European species of Leccinum Gray and notes on extralimital species

Henk C. den Bakker & Machiel E. Noordeloos. Persoonia 18(4): 511-587. 2005.

This paper deals with the generic delimitation of Leccinum and the taxonomic and nomenclatural implications of the phylogenetic results presented in previous papers by Den Bakker et al. (2004a, 2004b). 28S nrDNA data, used in the past to answer questions concerning genus delimitation of Leccinum, are re-analysed. The phylogenetic inferences based on 28S nrDNA largely coincide with Leccinum sensu Singer. The only species that is excluded from Leccinum is L. eximium. At least one truffle-like genus, Chamonixia, should be included in Leccinum. Morphological characters proposed in the past to delimit the genus are discussed in the light of the phylogenetic results. It is concluded that there is no single diagnostic morphological character that unites species of the genus Leccinum and that a better sampling, and other genes that provide a finer phylogenetic resolution, are needed to reach a final answer about the genus delimitation of Leccinum and other genera in the Boletaceae. The second part of this paper discusses characters used in Leccinum-systematics in the past and contains a revision of the European species of Leccinum with notes on related North American species. Sixteen species are accepted for the European continent, of which one, Leccinum albostipitatum, is described as new to science.

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