THALLOGENS. 259 
regularity (Fig. 322, 1, 2), and a thick and flexible tube issues 
from ‘the opening, which continues to grow till it attains the 
length of about fifteen times the diameter of the spore. The 
shorter grains are usually crowned with a sheaf and a bundle of 
secondary spores designated sporidia (Figs. 323 and 324). These 
Fig. 323.—Spores germinating. Fig. 324.—Sporidia. 
are very slender linear bodies united into pairs in their lower 
Part by a short and rigid band, which gives to the pair the form 
of the letter H. This bouquet of spores being matured, the germs 
soon destroy themselves. The reproductive pairs are then isolated : 
from each other, spreading abroad, without altogether dissociating 
themselves, on the surface of the subjacent body. Some germinate 
quickly, and emit, especially towards their summit, very fine 
filaments, which quickly spread themselves (Figs. 325 and 326). 
ers, and those in much greater numbers, give birth to secondary 
Sporidia, thickish oblong or arched bodies, which appear to be the 
ost important agents in the multiplication of Fungales. These 
will be secondary sporidia, which germinate while emitting one 
°r many very fine filaments at certain points of their surface.” 
Tae Smurs.—Blights or uredines are another family of parasitic 
belonging to the sneer of Concomycetes. They occur 
s 
