320 



BOTANY. 



for a few species only.* In all which have been examined 

 the spore sends out a promycelium, which is generally short 

 and jointed, and upon this several sporidia are produced, 

 much as in the TJredinese. In Tilletia caries the promyce- 

 lium produces a tuft of slender branches (Fig. 234, h), which 



Fig. 221. 



Pis. 232. 



Pig. 223. 



Pig. 231.— Spore-formation in VsHlago Maydls. a, the end of a spore-forming hy- 

 pha containing a row of young spores ; 6, anotlier spore-forming hypha, contaming 

 two young spores ; c, a spore nearly ripe, still surrounded by the gelatinous mem- 

 brane of the nyplia. X 1800. — After Fischer von Waldheim. 



Fig. 332.— Spore-formation in UsUlago antherarmn, c. an isoitf - <' gelatinous hy- 



g ha, with the contents distinctly breaking up— at the lower end a portion not yet 

 roken up ; 6, a number of gelatinous byphee fused into an irregular mass, showing 

 the formation of mimy spores ; c, a spore nearly ripe, still siirj'ounded by the gelat- 

 inous hypha membrane, also a young spore upon a lateral brunch, a and c X 1800 ; 

 b X 900— After Fischer von Waldheim. 



Pig. 223. — Formation of " solitary spores" in Sofispoi mm Saponarim. a, hyphie 

 witli two young spores; 6, a spore at a later stage; c, byphie with spores in differ- 

 ent stages of development ; at c' a thin wall has. formed around the contained pro- 

 toplasm as in & ; at c" the wall is much thicker, and at e'" it is still thicker. X 300.— 

 After De Bary. 



have been seen to unite laterally by a kind of conjugation 

 (not, however, of a sexual nature, in all probability) ; from 

 these branches (called by some writers " secondary spores ")f 



* According to Fischer von Waldheim, the germination of the fol- 

 lowing species is known, viz., lUletia caries, T. Lolii, UstUago an- 

 tkerarum, XT. floaeulonim, U. carbo, XT. destruens, TJ. Maydis, IT. recep- 

 taculorum, TJ. longissima, U. Vaillantii, Urocyatis pompJiolygodes. 

 Uroc. occulta. 



\ De Bary calls these branches sporidia, and what are here calle^ 

 sporidia, he calls secondary sporidia. 



