THE FUNGI WHICH CAUSE PLANT DISEASE 573 



Sterigmatocystis Cramer (p. 572) 



As in Aspergillus but with the sterigmata branched in whorls 

 at the apex. 



S. niger Van Tiegh. 



Hyphee slender, conidiophores erect, 800-1000 x 11-16 ii, thick- 

 walled, hyaline or dark above, the apical globose swelling black; 

 basidia 40 n long, radiately arranged, sterigmata obclavate, 8- 



FiG. 383.— B. pulchrum. After 

 Corda. 



Fig. 384.— Aspergil- 

 lus. From Strass- 

 burger et al., Text 

 Book of Botany. 



10 fi long; conidia globose, 3.4r4.5 n, minutely verrucose, violet- 

 brown, catenulate. On tobacco. 



S. ficuum (Reich.) Hen. 



Conidia globose, 3.8 fi, dark violet, thick-walled, smooth. 



In the fruits of figs in Asia Minor and United States. 



S. luteo-nigra Lutz. is injurious to cacao in the tropics. 



Penicillium Link (p. 572) 



Hyphse creeping; conidiophores erect, apically irregularly ver- 

 ticillate-penicillately branched; conidia catenulate, spherical, or 



