Perenniporia subacida (Peck) Donk (1967: 76)

Wang, Zheng-Hui, Wu, Zi-Qiang & Zhao, Chang-Lin, 2017, Type studies confirm that Perenniporia subacida and its four varieties are synonyms, Phytotaxa 305 (2), pp. 118-120 : 118-119

Perenniporia subacida (Peck) Donk (1967: 76)

Basionym: Polyporus subacidus Peck (1885: 92) .

≡ Poria subacida (Peck) Sacc. (1888: 6) ; Chaetoporus subacidus (Peck) Bondartsev & Singer (1941: 39) ; Oxyporus subacidus (Peck) Komarova (1961: 3) .

= Polyporus subacidus var. stalactiticus Peck (1885: 93) ; P. subacidus var. tenuis Peck (1885: 93) ; P. subacidus var. tuberculosus Peck (1885: 93) ; P. subacidus var. vesiculosus Peck (1885: 93) .

Note: Peck (1885) distinguished four varieties stating them to come from different hosts, but our examination of the types showed that all the five types were collected in the same locality, viz. Osceola, NY, USA and on the same host, i.e. hemlock, ( Tsuga sp ). The five type specimens shared the same morphological characters such as perennial, resupinate to effusedreflexed basidiocarps with dull cream to dingy-yellowish to pale tan color and small pores (4–6 per mm), a trimitic hyphal system with unbranched, strong dextrinoid skeletal hyphae and ellipsoid, non-truncate, non-dextrinoid basidiospores (4.5– 5.8 × 3.5–4.5 μm).

Our studies show that the four varieties of Perenniporia subacida are not different from the type variety and should be considered as synonyms of the latter.

In the Species Fungorum (www.speciesfungorum.org), the four varieties have been put under synonymy of Polyporus subacidus ; however, nobody has formally proposed this synonymy and we have not seen these varietal names listed synonymys of Perenniporia subacida in any other literature.

Specimens examined.— USA. New York: Osceola, on hemlock, August 1885, C. H. Peck , BPI 844697 ( BPI!, holotype of Polyporus subacida var subacida ) ; New York: Osceola , on hemlock, August 1885, C. H. Peck, BPI 844698 ( BPI!, type of Polyporus subacida var. tenuis ) ; New York: Osceola , on hemlock, August 1885, C. H. Peck, BPI 844699 ( BPI!, type of Polyporus subacidus var. tuberculosus ) ; New York: Osceola , on hemlock, August 1885, C. H. Peck, BPI 885855 ( BPI!, type of Polyporus subacidus var. stalactiticus ) ; New York: Osceola , on hemlock, August 1885, C. H. Peck, BPI 885858 ( BPI!, type of Polyporus subacidus var. vesiculosus ) .

Peck (1885) described Polyporus subacidus with four varieties, P. subacidus var. stalactiticus , P. subacidus var. tenuis , P. subacidus var. tuberculosus and P. subacidus var. vesiculosus . Currently, Polyporus subacidus is generally accepted as Perenniporia subacida based on its morphological characters. In the present study, we studied the types of Perenniporia subacida and its four varieties and the result shows that they are not different from the type variety and should be considered as synonyms of P. subacida .