Figure 341.—Polystictus biformis. Natural size. Frequently covered with green lichen.
Biformis means two shapes or appearances; referring to the condition of the pores in the young and the old plant.
The pileus is two to three inches wide, projecting from one to three inches, often imbricated so as to cover a large surface; laterally confluent, coriaceous, flexible, tough, subzonate, with innate radiating fibres, the cortex fibrillose, concolorous.
The pores at first very large, simple, compound, or confluent, round, elongated, flexuous; the dissepiments dentate, then lacerate, the hymenium finally resolved into teeth.
When I first found this plant the hymenium had resolved into teeth, and I supposed that I had found an Irpex. It is found in woods on logs and stumps. Very common with us. Frequently covered with a green lichen. July to November.
Polystictus hirsutus. Fr.
The Bristly Polystictus.
