Ryvarden, L. 2004. Neotropical Polypores. Part 1. Introduction, Hymenochaetaceae and Ganodermataceae. Synopsis Fungorum. 19:1-227
Page number : 139
Remarks (internal) : Inonotus munzii is one of a complex that also includes I. farlowii and I. cuticularis. It differs from these two species in the complete absence of hymenial setae and in its large basidiocarps and thick, duplex context.
Description : Inonotus munzii (Lloyd) Gilbn.
South-western Nat. 1:125, 1969. – Polyporus munzii Lloyd, Mycol. Notes 67:1163, 1922.
Basidiocarps sessile, often in large imbricate clusters, applanate to ungulate, 20 × 30 × 6 cm, upper surface bright yellowish brown at first, becoming reddish brown, short-hispid to tomentose, becoming rough-fibrillose to glabrous, finally rimose and blackened with age, pore surface yellowish brown, the pores angular, 2-4 per mm, with thin, lacerate dissepiments, context duplex at first, with a soft, spongy upper layer which rapidly deteriorates and disappears, leaving the lower context exposed, this becomes blackened and rimose, context lustrous golden brown, faintly to distinctly zonate, firm, fissile, up to 4.5 cm thick, tube layer clearly distinct from context, yellowish brown, up to l.5 cm thick, spore print bright yellowish brown.
Hyphal system monomitic, hyphae pale yellowish in KOH, thin- to firm-walled, simple-septate, with occasional branching, 3-9 ?m in diam, tramal hyphae similar, 3-7 ?m in diam.
Setal hyphae branched, abundant on upper surface of pileus, becoming thick-walled, with few to numerous branches, each tapering to a point, main axis of setal hyphae 5-10 ?m in diam.
Hymenial setae absent.
Basidia broadly clavate, 4-sterigmate, 15-20 × 7-9 ?m, simple-septate at the base.
Basidiospores broadly ellipsoid, golden brown, smooth, negative in Melzer’s reagent, becoming thick-walled, 6-8 × 4.5-6 ?m.
Substrata. On numerous dead hardwoods like Salix, Populus, Schinus molle, Morus alba ), Acer, Carya, Ficus, Quercus, Platanus, Sambucus , and Ulmus.
Distribution. South-western U.S. and Mexico. http://www.mycobank.org/...
Fruiting bodies are sessile, often in large clusters on the trunk, applanate
to hoof-shaped, 20 cm wide by 30 cm long by 6 cm thick at the base. The upper surface is initially a bright yellow brown becoming reddish brown with age. Pore surface is a yellow brown with angular pores, 2 – 4 mm/diameter. Inonotus munzii
causes a major white heartrot of living hardwoods and continues to decay dead standing trees and stumps. It is one of the main decay fungi of willow and cottonwood in the Southwest. It is also common on California pepper tree (Schinus molle), white mulberry (Morus alba) and many ornamentals in southern AZ (Gilbertson and Ryvarden 1986). Inonotus heartrot is often associated with water-stressed trees or wounds. The fungus is not considered a primary pathogen, but stressed trees will decline over many years. Branch dieback is common and large dead branches should be removed in populated areas (Olsen 1998).