THE FUNGI WHICH CAUSE PLANT DISEASE 571 



Conidia separating 



Head elongate 10. Doratomyces. 



Head globose or slightly clavate 



Sterile hyphse scanty 11. Haplotrichum. 



Sterile hyphse long, decum- 

 bent 12. Cephalosporium, p. 571. 



Fertile hyphse with 2 to several heads 

 Conidia upright on verticillate 



conidiophores 13. Ccemansiella. 



Conidia in more definite heads 

 Fertile hyphse simple, with 3 to 

 several heads of conidia on 



spines 14. Botryosporium, p. 571. 



Fertile hyphse several times 2 to 



3-fid 15. Trichodenna. 



Conidia borne on little stalks or sterig- 

 mata 



Fertile hjrphae simple 16. Corethropsis. 



Fertile hyphse verticillate branched. . 17. Spicularia. 

 Conidia short cylindric 



Conidia without mucus 18. Cylindrocephalum. 



Conidia covered with mucus 19. Acontium. 



Cephalosporium Corda 



Hyphse creeping, conidiophores short, erect, not apically swollen. 

 Conidia spherical or ovate, hyaline or slightly colored. 



The small spored condial forms often associated with Fusarium 

 (microconidia) belong to this form-genus. 



Botryosporium Corda 



Hyphae assurgent, simple or forked, elongate, irregularly later- 

 ally branched; fertile branches simple, with three or more short 

 apical branches which end in heads of conidia; conidia globose to 

 ovate. 



A genus of only about ten species. 



B. diffusum (Grev.) Cda. has been reported as parasitic on Cas- 

 uarina; 



B. pulchrum Cda. on wheat and radish. 



B. longibrachiatum (Oud.) Maire on various green-house plants. 



