270 



Explanation of Plates. 



PLATE XV. 



(All Figures X 250 unless otherwise stated.} 

 GERMINATION OF TELEUTOSPORES OF PUCCINIA MALVACEARUM. 



Fig. 



123. Germinating teleutospore, from each cell of which a promycelium has been 



pushed forth, cell contents collected towards apex of tube, and segmentation 

 commenced. 



124. Germinating teleutospore at a later stage, the promycelium having become divided 



into four segments, and comparatively stout tubes emitted from each seg- 

 ment. 



125. Two germinating teleutospores, in the one on the left only the two median seg- 



ments of the promycelium as yet bear sporidiola. 



126. Germinating teleutospore with stout elongated and contorted filaments arising 



from the promycelial cells, those from the two median cells ultimately giving 

 rise to abnormally small sporidiola. 



127. Germinating teleutospore in which the upper two promycelial cells have produced 



sporidiola, while in the third from the apex the formation of the sporidiolum 

 is just commencing. 



128. Germinating teleutospore, the promycelium bearing three sporidiola on stout 



elongated sterigmata. The sporidiolum second from the base is already 

 germinating and putting forth a germ tube extending across to the promy- 

 celium. The segment second from the apex has not so far produced a 

 sporidiolum, though a stout elongated filament has been emitted. 



129. Promycelial spores 



130. Germinating promycelial spore 



X 500 

 X 500 



NOTE. All the above were grown in droplets of water on slides in a moist cham- 

 ber, and prepared for photographing by being first dried, then fixed with a saturated 

 solution of mercuric bichloride, washed, rinsed in dilute acetic acid, washed again, 

 and after drying stained with alcoholic Bismarck brown, again washed and mounted 

 in orlycerine and water. 



