498 
F. L. PICKETT 
Figs. 36, 37. A. platyneuron. Plants collected in the field, probably more than 
twelve months old. Much of the old tissue was torn away in cleaning and mounting 
the specimens. (X 52.) 
Fig. 38. Camptosorus rhizophyllus. Plant from a culture thirteen months old. 
A-Rf regions of marginal growth. P, an independent secondary prothallium, 
formerly attached at T. S, root of a young sporophyte. Q, oldest portion of the 
archegonial cushion. See text for full description. (X 22.5.) 
