| Macroscopic characters | shape | Ungulate to columnar; large numbers of small, imbricate petaloid pilei |
| size | Up to 15 cm wide, 20 cm long and 15 cm thick |
| texture | Minutely tomentose; radially rugose |
| pileus | At first dull brown; becoming gray to grayish black; glabrous and hard and crustose |
| stipe | N/A |
| context | Yellowish brown; fibrous |
| pore surface | Purplish gray; becoming dark grayish brown |
| pores | Round; 5-7 per mm |
| tube layer(s) | Pale purplish brown; up to 2.5 mm thick; tubes whitish within |
| Microscopic characters | hyphal system | Trimitic |
| clamp connections | Present on contextual hyphae |
| sterile elements | Cystidia fusoid; hyaline; thin-walled; not projecting beyond basidia; 17-25 x 4.5-5 um with a basal clamp |
| basidiospores | Cylindric; hyaline; smooth; 10-14 x 3-4 um |
| Habitat characters | substrate/host | Known only on hardwoods , chiefly oaks. Fruiting may continue on recently killed or fallen trees |
| seasonality | Apparently annual or developing new tubes or pilei for 2-3 seasons |
| type of decay | White rot of the heartwood of living hardwoods on wounds in living trees |
| range | Through most of the eastern, Midwestern, and southeastern U.S. to east Texas. Not known from western North America or elsewhere in the world |
| Notes | Has distinctive sclerids in granular context. Easily recognizable because of large size and many imbricate pilei. |
| References | Overholts, 1953; Gilbertson & Ryvarden, 1986. |
