THE FUNGI WHICH CAUSE PLANT DISEASE 313 



Thecaphora Fingerhuth (p. 302) 



Sori in various parts of the host, often as indefinite masses in 

 the floral parts or forming rather firm pustules on the stem, at ma- 

 turity with a dusty spore- 

 mass; spore-balls composed 

 of few to many fertile cells, 

 of small to large size; rather 

 permanently united; spores 

 usually yellowish or reddish, 



smooth on contiguous sides Fiq. 228.— Thecaphora, spore ball germina- 



but usually marked on the *'°°- ^^'^ ^retold. 



free surface; germination, so far as known, by means of a single 



sporidium at the tip of the elongate septate promycelium. 



A small genus of slight economic importance. 



T. deformans Dur. & M.^^e- 129 



Sori in the seeds, showing when the legumes are broken open 

 as reddish-brown, dusty spore-masses which destroy most of the 

 seeds; spore-balls reddish-brown, ovoid to spherical, rather firm, 

 composed of 3-25 (usually 7-12) spores, chiefly 27-60 n in length; 

 spores in optical section triangular to polygonal or when free 

 irregular oblong, free surface with papillae that sometimes vary to 

 spiny processes, 15-25 n, chiefly 15-20 m in length. 



On a large number of Legiuninous hosts, including species of 

 Vicia, Lathyrus, Lupinus, Trifolium, etc., in widely scattered 

 regions of both the old and the new world. 



Tolyposporiuin Woronin (p. 302) 



Sori usually in the inflorescence, especially the ovary, forming 

 granular spore-masses at maturity; spore-balls dark-colored, of 

 numerous spores permanently united, germination about as in 

 Ustilago. 



A genus of about ten species. 



T. bullatum Schr.i^s- 1^ 



Sori in ovaries, infecting occasional ones, ovate, about 3-5 mm. 

 in length, covered with a thin, greenish, smooth membrane, upon 

 rupture of which the black granular spore-mass becomes scattered; 



