Description from “Chamuris, G.P. 1988. The non-stipitate steroid fungi in the northeastern United States and adjacent Canada. Mycologia Memoirs. 14:1-247”
PUNCTULARIA STRIGOSQ-ZONATA (Schwein.) Talbot, Bothalia 7:143. 1958. • FIG. 62 Basionym: Merulius strigoso-zonatus Schwein., Trans. Amer. Philos. Soc. (n.s.) 4:160. 1832. Basidiomata annual; effuso-reflexed, rarely wholly resupinate or sessile; coriaceous-ceraceous; confluent, imbricate on vertical substrata. Reflexed part umbonate to dimidiate at first, occasionallt becoming laterally extended. Upper surface matted-tomentose to strigose-hirsute; zonate, furrowed; brown to gray, sometimes with black zones. Hymenial surface even when young, becoming folded radially (phlebioid), sometimes slightly tuberculate; cracking; polished or dull; gray, brown to black, sometimes with yellow to orange margins. Cutis dark brown. Hyphal system monomitic. Hyphae with clamps; hyaline to brown; 3 – 5 pm diam. Dendrohyphidia forming a catahymenium; thin-walled; hyaline to yellow; usually embedded in a yellowish brown, resinous layer that cements hyphae, dendrohyphidia and basidia, thus obscuring hymenial details; 1 – 2 um diam at branch tips. Basidia subcylindrical to subclavate; 4-sterigmate; basal clamp present; arising in subhymenium and protruding beyond the cemented, dendrohyphidiaI layer; of variable length, 4 – 6 pm diam. Basidiospores ellipsoid; hyaline to pale yellow; smooth; thin-walled; negative in Melzer’s; 6 – 8.5 × 3 – 4 pm. Distribution: Widespread. Substrata: Dead hardwood limbs and trunks, displaying a preference for Populus tremuloides in the study area. Discussion: Punctularia strigoso-zonata is easily recognized in the field by its effuso-reflexed, coriaceous-ceraceous basidiomata, dark brown to black, radially ridged hymenial surface, and preference for the wood of P. tremuloides. when strongly reflexed to sessile P. strigoso-zonata may resemble Hymenochaete rubiginosa in the field, but lacks setae and possesses clamp connections and dendrohyphidia. Microscopically it is characterized by its hyaline to brown hyphae with clamps, dendrohyphidia in a resinous layer, and hyaline to yellow basidiospores. In his description of this species Cooke (1956) described gloeocystidia. It is my opinion that the yellow, clavate hyphal ends are aborted basidia that have taken on color from the resinous material cementing the hymenial elements. P-£scriptions and i I lustrations: Cooke, 1956 (extensive synonymy given); Cunningham, 1963; Davydkina, 1980; Lincoff, 1981.