THE FUNGI WHICH CAUSE PLANT DISEASE 601 



Hyphae capitate branched at tip 5. Haplographium. 



Some sterile hyphse erect and mixed with 



the fertile 6. Hormiactella. 



Hormodendrum Bonarden (p. 600) 



Hyphae creeping; conidiophores erect, septate, brown, variously 

 dendritically branched; conidia catenulate on 

 the branches, globose, ovoid, olivaceous to 

 fuscous. 



About a dozen species. 



H. hordei Bruhne on barley stems and 

 leaves often reduces the yield. 



Spots brown, scattered over the entire leaf or 



confluent, oblong; hyphae simple, septate; co- 



• .. . ,. f. J ,' , ' FiQ. 403.— H. hordei 



mdia various, cyimdric, rounded or subatten- After Bruhne. 



uate, or ellipsoid to subglobose, verrucose. 



Dematiacea-Didsrmosporae (p. 594) 

 Conidial 1-celled, dark, rarely hyaline, ovoid or oblong. 



Key to Geneea op Dematiaceae-Didymospors 



Hjrphae very short or scarcely different from 

 the conidia 

 Conidia not in chains 



Hyphse lacking 1. Dicoccum, p. 602. 



Hyphae present, circinate 2. Cycloconium, p. 602. 



Conidia in chains 3. Bispora. 



Hyphae distinctly different from the conidia 

 Conidia smooth, muticate 

 Conidia not capitate 

 Conidia more or less catenulate at 

 first 

 Hyphae and conidia biform, the 

 latter 1-celled or continuous, 



dark or hyaline 4. Epochnium. 



Hyphse and conidia uniform 

 HyphsB here and there inflated 5. Cladotrichum. 



