Reproductive structures, sexual and asexual, are descr. in 4 spp. of Hymenophyllum in culture 6-10 yrs, and in 3 spp. of Trichomanes in culture 15 mos.to 10 yrs. Sex organs appeared in H. holochilum in 20 mos., in H. acanthoides in 3-1/2 yrs., and in T. auriculatum and T. bilabiatum in 9-10 mos. The antheri-dia of Hymenophyllum are large and similar to those of the Os-mundaceae; in Trichomanes they are smaller and simpler. The archegonia in Hymenophyllum arise on discontinuous marginal cushions 2 cells thick and of varying areas. Those of Trichomanes are borne on more or less globose archegoniophores; the archegonium initial is wedge-shaped. The development of the archegonium is similar to that of other leptosporangiate ferns; in the axial row are egg, ventral canal cell, and 2 neck canal nuclei often notably large. The neck is approx. straight, usually 7-8 cells long in Hymenophyllum and 4 in Trichomanes. In many cases the basal cell divides vertically or horizontally at an early stage; the jacket layer of the venter is not well developed. T. auriculatum bore gemmae at intervals after the cultures were 3 yrs. old. Apogamy was of frequent occurrence in T. auriculatum after the cultures were 4 yrs. old as expandec growths or leaf like blades with glandular sporophytic hairs.