Polyporales » Cerrenaceae » Radulodon

Radulodon americanus

Radulodon americanus Ryvarden 1972, in Ryvarden, Canadian Journal of Botany, 50(10), 2073-2076 (1972)

Diagnosis: Fruit body resupinate, adnate and hydnaceous, teeth 1-5 mm long, often fused at base, smooth or slightly fimbriate to finely dentate along the edges and in the apices, ochraceous to pale buff, cartilaginous, when dry with clusters or slender semipyramids of fused teeth, subiculum white, coherent when fresh, cracking up when dry, up to 2 mm thick, hyphae hyaline, clamped, 1.5- 4.5 µ in diameter, basidia suburniform 20-40 X 5-10 µ with 4 basally curved sterigmata, 2-5 µ long, cystidia none, spores smooth, hyaline, non-amyloid, globose to subglobose, 4-6.5 µ  in diameter, apparently restricted to Populus species.

The species seems to be restricted to North America in a zone stretching across Northern United States and Southern Canada. In all, 38 collections were examined from the states of Idaho and New Hampshire, and the provinces of British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, and New Brunswick. The following hosts have been noted: Popzrlus tremuloides, P. balsamifera, P. grandifolia, and P. triclzocarpa. The species is reported to be a serious pathogen in some areas of Ontario (Basham 1958) and produces a yellow stringy heartrot in the attacked trees. Nobles (1958) has studied the species in culture and placed it in her group 54 as bipolar, producing extracellular oxidase and with simple septa in the hyphae in the advancing zone, clamps in the older part of the culture.

Index Fungorum Number: IF322216



Figure 1. Radulodon americanus, spores and basidia (from typus)



Basham, J. T. (1958). Decay of trembling aspen. Canadian Journal of Botany, 36(4), 491-505.

Nobles, M. K. (1958). Cultural characters as a guide to the taxonomy and phylogeny of the Polyporaceae. Canadian Journal of Botany, 36(6), 883-926.

Ryvarden, L. (1972). Radulodon, a new genus in the Corticiaceae (Basidiomycetes). Canadian Journal of Botany, 50(10), 2073-2076.


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