Name: Polyporus arcularius
Author: (Batsch) Fr.
Citation: Syst. mycol. (Lundae) 1: 342 (1821)
Preferred Synonyms:Lentinus arcularius (Batsch) Zmitr.
Deprecated Synonyms: Boletus alveolarius Bosc, Boletus arcularius Batsch, Boletus exasperatus Schrad., Favolus agariceus (Berk.) Lév., Favolus alveolarius (Bosc) Fr., Favolus ciliaris Mont., Favolus curtisii Berk., Favolus hondurensis (Murrill) Sacc. & D. Sacc., Favolus portoricensis (Murrill) Sacc. & D. Sacc., Favolus squamiger Berk., Hexagonia hondurensis Murrill, Hexagonia portoricensis Murrill, Leucoporus agariceus (Berk.) Pat., Leucoporus arcularius (Batsch) Quél., Polyporellus agariceus (Berk.) Pilát, Polyporellus alveolarius (Bosc) P. Karst., Polyporus agariceus Berk., Polyporus alveolarius (Bosc) Fr., Polyporus anisoporus Delastre & Mont., Polyporus arculariellus Murrill, Polyporus arculariformis Murrill, Polyporus calaber F. Brig., Polyporus handelii Lohwag, Polyporus intermedius Rostk., Polyporus nanus Durieu & Mont., Polyporus penningtonii Speg., Polyporus rhombiporus Pers., Polyporus vanderystii Lloyd, Polyporellus arcularius (Batsch) P. Karst.
This species is recognized by the scaly pileus surface, ciliate margin, yellowish to brown, centrally stipitate basidiomata, and the large, hexagonal pores (1–2 per mm). According with Louza & Gugliotta (2007), the ciliate margin and the
scaly pileus surface are variable characteristics. Polyporus arcularius is similar to P. tricholoma, but the colour of the basidiomata (pale brown and white to cream, respectively), pores size (1–2 per mm and 4–6 per mm, respectively) and stipe morphology (velutine and glabrous, respectively) distinguish these species. The presence of hyphal pegs in P. arcularius discerns this species from P. arcularioides A.David & Rajchenb. (Silveira & Wright 2005).
KNOWN DISTRIBUTION: Cosmopolitan, except for the boreal zones (Núñez & Ryvarden 2001). In the Brazilian Amazonia, reported in the states of Pará and Rondônia (Gomes- Silva & Gibertoni 2009).
SUBSTRATE: on dead angiosperm.
MA TERIAL EXAMINED: BRAZIL. P ARÁ, Floresta Nacional de Caxiuanã, T.B.Gibertoni, III/2007 (URM 79819).
From The Polyporaceae of North America
By William A. Murrill
This species was described by Batsch as follows: “Stipitatus; stipite subgracili, subclavato; pileo membranaceo convexo, subulato-fimbriato; stipiteque concoloribus, spadiceo-rufis; cellulis latissimis, rhombeis, aequalibus albis.” Fries placed it in the genus Favolus, which he treated as a subgenus under Polyporus. Its tubes are certainly favoloid, but its close relationship to P. Polyporus has kept it near this species rather than with species of Favolus. Wright’s specimen of P. lentus from Connecticut seems nothing more than P. arcularius. There is at Kew also the remains of a specimen from Ohio, which very probably belonged in the same category.
P. arcularius shows little variation except in size throughout its wide range. It occurs on decaying wood and shows much the same habit as P. elegans and P. Polyporus, but differs from these species in occurring more abundantly in the south.