Description of the Figures, xi 



FIG. 



the branched creeping mycelium, bearing short spinu- 

 lose branches, X 200. 



75. Zygospore of same, X 40. (After Van Tiegheim.) 



76. Optical section of sporangium of same, x 200. 



77. Spores of same, x 400. 



78. Polypliagus Euglence, zoogonidium showing a dark 



sjihere of fatty matter and a nucleus, x 550. 



79. Young specimen of the same grown from a zoogonidium 



wiih a rhizoid attached to a resting Euglena, e, 

 X 350. 



80. Zoosporangium of same with zoogonidia just formed, 



resting on the mother-cell (prosporangium), a, from 

 which it originated ; on the latter are three rhizoids, 

 X 400. 



81. The same showing conjugation ; a, the receptive in- 



dividual ; h, the supplying individual ; s, the swollen 

 end of the conjugating tube connecting a and h (this 

 portion is the commencement of the resting-spore) ; 

 e, e, the EiiglencB attacked by the fungus, x 350. 



82. A portion of the conjugating pair in Fig. 81, 5|- hours 



later than shown in Fig. 81 ; 5 and s, the same as 

 before, h is now empty and .s' mature, X 350. (All 

 after Nowakowski.) 



Plate V. 



83. Tilletia striiformu, on leaf of Glyceria Jfuitans, nat. 



size. 



84. Spore of same, x 1200. 



85. Vstilago salven, spore^ X 1200. 



86. Urocgdis colchici, on portion of a leaf of ColcMcum 



autumnale, nat. size. 



87. Spore-clusters of same ; «, central fertile cells ; h, pale 



peripheral sterile cells, X 400. 



88. Thecaphora hyalina, spore-clusters, X 400. 



89. Isolated spores of same, showing the free portion of 



each spore warted ; the flattened sides that are in 

 contact w^hen in the cluster are smooth, x 400. 



90. I^rotort'yces conco7nitans, portions of hyphse with inter- 



calary and terminal spores growing in the cells of an 

 orchid leaf, highly X (After Berkeley.) 



