14 



BOTANICAL GAZETTE 



[JULY 



Peltandra is more spherical in form and less caeom 

 material of the aecidia on Peltandra was poorly fixed 



My 



few sections were cut. 



from 



the general shape of the cup here is as Richards has drawn it. A 



comparative study of the aecidia on these 

 two hosts should be of interest in determin- 

 ing the relative influence of the host tissues 

 on the morphology of the fungus. 



The aecidia of P. angustata, P. Hydro- 

 cotyles, and P. Eatoniae are less favorable 

 for study than any of the foregoing species. 

 The cells of the young aecidia of these 

 forms form a more compact hyphal mass, in 

 which the direction of the individual hyphae 

 is more difficult to trace. The pseudopar- 

 enchymatous tissue of all 3 forms is exten- 

 sive and reaches to the lateral surfaces of 

 the young aecidia, and to a deep point at 

 their basal surfaces. My material of these 

 forms was somewhat old, and the series of 

 early stages is consequently less complete 

 than in the case of the others. The direc- 

 tions of growth of the hyphae and their 



Fig. 3.-Section through differentiation into the tissues of the CU P 

 the young aecidium of P. m .. , 



Eatoniae: a, apical surface; are essentially similar to those described 

 b, basal surface; g, gam- for P. Claytoniata. The gametes of these 

 etk tissue; p, pseudoparen- forms are not SQ sharpIy differentiated from 



chyma. ^ , * 



the cells of the pseudoparenchyma and tne 

 underlying vegetative tissue, and often cannot be distinguished 

 with certainty except w r hen found fusing. 



Since all my material of P. angustata was rather old, the gametes 

 or fusion stages were not observed. The location of the two-legged 

 basal cells seen (figs. 26, 27) seems to indicate that the gametes lie 

 at the very bases of the perpendicular gametophoric hyphae. In 

 P. Eatoniae the perpendicular hyphae are completely sterilized and 

 the gametes are found in the upper two or three layers of the hori- 

 zontal hyphae that line the basal surface of the hyphal mass. This 



