The Reproduction of Ahnfeltia plicata. g 
been met with on the fronds. Hyaline hairs have certainly 
been observed in the young disc-shaped germlings (see 
below p. 20, fig. 17), but they were long and had the 
typical cylindrical shape, not being attenuated upwards. It 
Fig. 6. Vertical sections of nemathecia, October, showing groups of gener 
ative cells and horizontal or obliquely upward growing cell-rows spring- 
ing from them. 625:1. The group of generative cells in fig. B is situated 
at the boundary between the nemathecium and the cortex. 
is doubtful whether this wart was a nemathecium or only 
a sterile wart; at all events it was not normal, but de- 
generated in the middle. The first described included car- 
pogonium-like cells may perhaps also be considered sterile, 
undeveloped hair-cells. The fact that they are never borne 
on particular cells comparable to carpogonial filaments but 
