Polypore survey of Finland 5. The genus Polyporus

Abstract

Distribution maps are presented for nine Polyporus species occurring in Finland. The commonest are P. brumalis (Pers.: Fr.) Fr. and P. ciliatus Fr.: Fr. A strictly southern species is P. badius (Pers.) Schw., which has been found in two places only, and to a lesser extent P. umbellatus (Pers.: Fr.) Fr.; both of these are classified as threatened. A widespread species with a southern emphasis is P. melanopus (Pers.: Fr.) Fr., from which P. tubaeformis Karst has been separated. P. pseudobetulinus (Pi!.) Thorn, Kotiranta & Niemelli (syn. Piptoporus p.) has two localities in Finland and is considered to be threatened. P. squamosus (Huds.: Fr.) Fr. is sparsely distributed over the whole country and has two ecotypes, one growing on large park trees in old towns in the south, and the other a dwarfed kind inhabiting riparian thickets and having a northerly distribution. P . leptocephalus (Jacq.: Fr.) Fr. (P. varius (Pers.: Fr.) Fr.) has a similar dual ecology, occurring both on dead, old-forest aspen trunks and on living park trees of various genera. All the species cause a white-rot, and, except for some questionable records from conifers, grow exclusively on hardwoods. Only P. squamosus does significant harm as a pathogen, causing decay in park trees.

Sorbus aucuparia L.

“…Nobles was found in Scotland (Kirk & Spooner 1984). In their study of the genus Polyporus in Finland, Niemelea & Kotiranta (1991) recorded the following species on S. aucuparia : Polyporus brumalis Fr., P. ciliatus Fr., P. leptocephalus (Jacq.:Fr.) Fr., P. melanopus (Pers.)…”

New records of rare and threatened polypores in Finland

“…(1990). So far the only known extant occurrence was in northwestern Finland (Niemela & Kotiranta 1991). An extensive survey of virgin forests (Old Forest Inventory Programme) in East Finland in the summer of 1992 revealed these new localities of P. pseudobetulinus .…”

Polypores and associated beetles of the North Karelian Biosphere Reserve, eastern Finland

“…Breeding records meet the criteria set by Lawrence (1973: 165). The commonest Finnish polypores (Niemela 2003a) with comparatively well known coleopteran fauna were not survey ed. Dead, but fairly well-preserved basidiocarp; original outer and inner structures are still easily seen.…”