Forsstroemia trichomitria 1. Forsstroemia producta 1. Pterigynandrum trichomitrion Hedwig, Spec. Sullivant Secondary stems usually subpinnately branched. Sporophytes usually present.
Spores mature in winter.
However, from Virginia northward, capsules are nearly always either emergent or exserted. Epiphytic on trees and occasionally boulders. Known from only five sites north of Mexico, with recent efforts to recollect in Ohio unsuccessful.