Phaeocollybia in western North America 4: two new species with tibiiform cheilocystidia and Section Versicolores reconsidered.

摘要

Two new phaeocollybias are described from the coastal and coastal montane coniferous forests of California, Oregon, and Washington, USA. Phaeocollybia rufotubulina, closely related to the gregarious, hollow-stiped P. californica and P. scatesiae, differs in pileipellis pigments, pseudorhizal branching pattern, and restriction fragment length polymorphism profile. P. tibiikauffmanii differs from the similarly robust, orange-brown, viscid capped P. kauffmanii in its thick-walled narrow-necked capitulate cheilocystidia. Phenetic and cladistic analyses of restriction data generated from 37 isolates representing P. californica, P. pseudofestiva, P. scatesiae, P. spadicea, P. radicata, and the 2 new species support the existence of a clade characterized by thick-walled tibiiform cheilocystidia. Characters previously used to diagnose Section Versicolores are re-examined, and the implied phylogenetic separation of the vernal P. pleurocystidiata from the fall-fruiting tibiiform western species is discussed.