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Page number:5 
Description type:Non-original description 
Description:IRPEX ZONATUS Berkeley, London Journal o f Botany, vol. 6, p. 168, 1845. Fig. 3.
Hymenophore annual, imbricate, coriaceous, attached by a broad base. Pileus dimidiate, applanate, sometimes conchate, 1-3 cm. x 0.5-3 cm. x 2-4 mm.; surface ochraceous or bay-brown, concentrically zoned and sulcate, radiately striate, at first delicately pubescent, becoming glabrous; margin acute, lobed, plane or inturned, cuticle wanting; hymenial surface bay-brown or ferruginous, ochraceous when fresh, fertile to the edge, irpiciform. Context cream or pallid ochre, to 1.5 mm. thick, compact, hyphae radiately arranged; skeletal hyphae to 6 µm thick, lumen 1 µm, or almost obliterated, unbranched, aseptate, tinted blue with stain; generative hyphae to 3 µm thick, wall 0.5 µm, septate, branched, staining, with clamp connections. Pores at first angular or linear, when 3-4 per mm., soon torn into spines which may reach a length of 5 mm., tapering to an acute point, even. Basidial type clavate, basidia clavate, 8-12 x 3-5 µm, persistent. Cystidia absent. Spores elliptical, often flattened on one side, 4-6 x 1.5-2 µm, smooth, hyaline.
DISTRIBUTION: Ceylon; New Zealand.
HABITAT: Growing imbricate upon bark and decorticated wood of fallen branches.
Salix fragilis L.
Wellington. Lake Horowhenua, May, 1919, G. H. C.
Specimens listed agree with the type at Kew, ex Ceylon, and were so named by the late E. A. Burt.
In general appearance the species closely resembles I. brevis, and possesses a similar microstructure. It differs in the absence of cystidia, smaller basidia, larger spores, larger darker coloured spines, and the prominently sulcate surface of the pileus which in young plants is finely tomentose.
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