Authors: Niemelä, Tuomo & Dai, Yu-Cheng & Kinnunen, Juha & Schigel, Dmitry S.
Journal: Karstenia, Volume 44 (2004), Issue 1-2, pages 67-77.
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Key words: Basidiomycota, Postia balsamina, Postia luteocaesia, Postia persicina, polypore, taxonomy
Abstract: Two new species of polypores are described: Postia balsamina Niemelä & Y.C. Dai and P. persicina Niemelä & Y.C. Dai. They were collected on Picea abies in Northern boreal zone. Postia balsamina is white, fleshy and almost resupinate, monomitic, and bears rather thin-walled, acute cystidia with minute apical encrustation; cystidia are usually found in hymenium close to tube orifices and their amount increases by age. The species is reported from northern Finland and Sweden. It resembles P. balsamea (Peck) Jülich, which is pileate, more tough, with smaller spores and pores; P. balsamea occurs as rare in South Finland, and its distribution in Europe is southerly. P. persicina is beautifully orange-red, pileate, and its white pore surface turns yellow when drying. Externally it resembles Tyromyces kmetii (Bres.) Bondartsev & Singer, which grows on angiosperm trees and whose spores are much thicker. In addition to Finland, it was found once in Russian Karelia, growing on spruce. P. luteocaesia (A. David) Jülich is reported from Finland. It is compared to the closest related species, P. caesia (Fr.) P. Karst., P. subcaesia (A. David) Jülich, P. alni Niemelä & Vampola and its brief description is included.