312 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
pores; that the lobes are delicate, veiny, and spreading; and that the spores 
are almost black, 85 u in diameter, and covered with low crenulate crests. 
The undivided air chambers which Stephani emphasizes apparently show that 
F, stahlit is a relative of A. tenella, and the long androecia, borne on special 
branches, point pretty definitely to A. pringlei. Unfortunately there are a few 
marked discrepancies. The epidermal pores, for example, are far more complex 
than those of A. pringlei, where the number of cells in each radiating series is 
almost invariably two. The appendages, moreover, give no indication of vari- 
ability, and it would hardly seem possible that the curious marginal teeth so 
often found in A. pringlei could have escaped Stephani’s attention, if F. stahlii 
and A. pringlet are actually the same. Even if they are not the same, however, 
they are evidently closely allied. 
if. 
