Abstract

MATHENY, P. Brandon; AIME, M. Catherine; SMITH, Matthew E.  and  HENKEL, Terry W.. New species and reports of Inocybe (Agaricales) from Guyana. Kurtziana [online]. 2012, vol.37, n.1, pp.23-29. ISSN 1852-5962.

Since our last report in 2003, we document the discovery of an additional seven species of Inocybe from Dicymbe (Fabaceae) forests of Guyana in northeastern South America. Of these, five are described as new: I. enigmatica, I. lepidotella, I. magnifolia, I. marginata, and I. rhodella. Two additional species described originally from Brazil and Venezuela, I. amazoniensis and I. lasseri, respectively, are reported as new records for Guyana. This raises the number of Inocybe species reported from Guyana to eleven. Molecular identifications of ectomycorrhizal root tips of species of Dicymbe and Aldina (Fabaceae) match five of the known Inocybe species from Guyana. An additional eight Inocybe ITS sequences distinct at the species level were detected from ectomycorrhizal root tips of Fabaceae in Guyana but at present match no known morphological species represented in regional or global sequence databases. A revised key to species of Inocybe from Guyana is presented together with illustrations of new taxa. Data from examination of types of I. amazoniensis and I. matrisdei are presented, as well as supplementary reports of I. epidendron and I. pulchella, both originally described from Guyana.

Keywords : Ectomycorrhizal fungi; Fabaceae; Guiana Shield; Inocybaceae; Neotropics; New species; South America; Systematics.

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