Summary:
Features include minute, hanging, tall tubular whitish cups, stem absent except as a narrowing to bring fruitbodies on oblique surfaces to a vertical position, growth on dead wood, scattered in small groups or densely crowded in large colonies, and microscopic characters including external dichophytic hairs except at extreme margin, and basidia. Reid''s description is for var. americana which he says differs from the type variety only in having clamp connections (while Cooke says basidia of the type are 4-spored, Reid found only 2-spored basidia in the type: if this is true throughout the collection, it may be a consequence of a haploid state and then the absence of clamp connections would be of questionable taxonomic significance), (Reid).

Microscopic:
spores 4.5-5.75 x 4-4.75 microns, broadly elliptic to nearly round, with short lateral or oblique apiculus, smooth, colorless, thin-walled; basidia either 2-spored or 4-spored, up to 30 microns long and 8 microns wide, clavate, with elongated narrow bases ending at a clamped septum; cystidia and gloeocystidia absent; hyphae of context up to 2 microns wide, thin-walled, colorless, bearing clamp connections although these are difficult to demonstrate, in one collection there are crystalline masses in context but there is very little development of oleaginous droplets (unlike. H. candida); toward outer surface some of the hyphae curve away and end as irregularly dichotomously branched hairs, occurring anywhere on exterior except extreme margin, the hairs tapering from unbranched base to ultimate branchlets often less than 1 micron wide, branching often limited to one or two dichotomies near the hair tip except at base of fruitbody, forking often unequal and only one of the branches having a second dichotomy, bases of hairs up to 3.5 microns wide with very slightly thickened walls, occasional secondary septa in basal region of hairs, in basal part of fruitbody, hairs more freely branched and have slightly thicker walls, (Reid), spores 5.8-8.7 x 5.8-8.7 microns, round or nearly round (but note that Reid measured the spores of the type as 4.75-6.2 x 3.75-5 microns, round to very broadly elliptic), apiculate, strongly granular, appearing roughened under lower magnifications but smooth under oil; basidia 4-spored, 24 x 7.5 microns (but Reid found them to be up to 40 x 8 microns in type and 2-spored in the ones he observed in type), ''cup'' covered with large dichophyses (dichotomously branched terminal hyphae) 5.8-8.7 microns in diameter at base (but Reid measured the bases in type to be 3.5(5) microns wide), reaching 60-75 microns long, finely branched at tips, context hyphae more or less pseudoparenchymatous (questioned by Reid), 3.5-5 microns in diameter, no clamp connections seen; subhymenial hyphae 2.5-3 microns in diameter, (Cooke)

Notes:
Henningsomyces puber is found in BC, ON, CT, and MI, (Ginns), and Sweden, (Cooke).

Synonyms and Alternate Names:
Polyporus pubescens Schumach.: Fr.
Solenia pubera Romell ex W.B. Cooke