GRIFFITHS: CONCERNING SOME WeEsT AMERICAN SMUTS 85 
Ustilago calcara sp. nov. 
Sorus circular, .5 mm. in diameter to linear and confluent, 5 
mm. or more in length extending between the veins and erum- 
pent upon the exterior of the modified, overlapping sheaths, and 
less frequently upon the leaves ; internodes and culms in diseased 
host very much shortened and repeatedly branched, producing 
miniature witches’ brooms ; spores sooty, black in mass, irregular, 
globular to ovate, and often pointed, 7-10 # by 7-10.5 #t with one 
ee contortum, showing upper sheath and sterile membrane, 2. 2. 
Outline o 2 spore-ball, 215. 3. Spores, X 315- 
4. Spores of Utilave Scolochloae, K 320. 
5. Ztlletia pulcherrima in spikelet of Panicum obtusum, <2. 6. Spore, X< 315- 
7. Upper portion of culm of Br agrostis Neo- Mexicana, showing method of attack 
OF re a stranguians. Natural s 
pores of Ustt/ago calcara on nie ee te breviseta, X 315 
9. Spore-ball of Thecaphora Thornberi, X 35. 10. Dortiae of the spore-ball, 
XX 315, showing outlines of the individual spores. 
II. Spores of Ustilago lycuroides, X 315. 12. Ovary of the host distorted by the 
smut, ei 8. 
. Spikelet of Eriochloa punctata showing distortion of ovary by Sorosporium 
Eri. iochioae, x 5. 14. Distorted ovary ohn method of rupture, X 8. 15. Outline 
of spore-ball, oC 215. 46. Spores, <3 
17. Spore of 7iéletia Wilcexione, # 
