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EXPLANATION OF PLATES III-VI 
All drawings were made with a Spencer camera lucida. In all drawings 
showing nuclear detail a Zeiss 2™™ apochromatic objective with compensating 
oculars was used. The drawings and photomicrographs were then reduced to 
the magnifications indicated in the explanation of figures. 
PLATE III 
Fic. 1.—Diagrammatic sectional view of sporocarp; A, B, C, D designate 
planes; C’, soral pad attached to vascular bundle and subtending a single sorus. 
Fic. 2.—Portion of a section showing three sporangia of the oldest series 
(right) containing megaspores, and one (left) containing microspores. X 49. 
