1HE UBRARY OF THE 
SEP 3 1943 
UNIVERSITY OF ILLINOIS 
70 Ohio Biological Survey 
EXPLANATION OF PLATE VI. 
P'ig. 20. Three groups of internal male reproductive organs from a Collema-Vikt 
plant collected near Peebles, Ohio, x 1,000. Note how these male cells 
compare in form and size with the spermatia in Figs. 21, 22 and 23, drawn 
to the same scale of magnification. 
Fig. 21. Portions of three basidia of CoUema pulposiim, showing five spermatia 
attached, x 1,000. 
Fig. 22. Portions of two basidia of Leptoghim chloromelum, showing four sper¬ 
matia attached, x 1,000. 
Fig. 23. Portions of four basidia of CoUema microphylhim, showing ten spermatia 
attached, x 1,000. 
Fig. 24. Portions of three basidia of SynecJwblastiis pycnocarpiis, showing twelve 
spermatia attached, x 870. 
Fig. 25. A vertical section through a spermagonium of Synechoblastus ohiocnsis, 
showing the ostiole, many basidia, numerous spermatia, some attached and 
others free in the cavity of the spermagonium, hyphge surrounding the 
spermagonium, and a few chains of cells and two free heterocysts of the 
algal host x 580. 
