PLATE XXXIII 
Fig. i.—Section through young sorus, showing hyphal aggregates preceding spore 
formation. X 710. Photomicrographed by author. 
Fig. 2.—Section through immature sorus. Note the hbrovascular bundle on the 
left, about which the spores, none of- which were as yet quite mature, were develop¬ 
ing in groups even in the earliest stages. X 365. Photomicrographed by author. 
