Monograph of Chroogomphus (Gomphidiaceae)

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Abstract
The subgenus Laricogomphus in the genus Gomphidius is abandoned, leaving 2 subgenera Chroogomphus and Gomphidius. The amyloid spp. of Laricogomphus are placed in Chroogomphus and the dextrinoid spp. in Gomphidius The mycelium surrounding sporophores of both subgenera were found to contain clamp connections, a new family character in the Gomphidiaceae. The spp. of Chroogomphus have amyloid mycelium; this is the 1st report of vegetative amyloid mycelium in the Homobasidiomycetes. Nuclear staining of the amyloid spp. of Chroogomphus was demonstrated by the Feulgen reaction but no staining was observed in the nonamyloid subgenus Gomphidius. The subgenus Chroogomphus is elevated to the status of a genus in the Gomphidiaceae and includes section Floccigomphus with 3 spp. and section Chroogomphus with 5 spp. Additional information on the distribution and ecology of the spp. is presented.

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