Newly recorded in the Netherlands—III. Tyromyces semisupinus

Polyporus semisupinus Berk. & Curt. apud Berk. in Grevillea 1: 50. 1872. — Tyromyces semisupinus (Berk. & Curt.) Murr. in N. Am. Flora 9: 34. 1907. — For other synonyms see Donk (1974: 180). Fruitbodies resupinate to effused-reflexed or in the shape of sessile, dimidiate pilei, measuring up to 4x2X0.2-0.3 cm, often narrowed at base, with acute edge. Upper surface rough, whitish, locally brownish. Resupinate parts with white tomentose margin or fertile up to well defined edge. Context and very thin subiculum white, tough, coriaceous when fresh, rigid after drying. Tubes 1-2 mm long; pores angular, 0.15-0.25 mm in diam., 4-6 per mm; dissepiments very thin; pore surface cream to light yellow when fresh, (light) orange after drying.