586 



THE FUNGI WHICH CAUSE PLANT DISEASE 



Hyphae inflated at both apex 



and joints 2. Arthrobotiys. 



Hyphae not inflated 

 Conidia spirally pleurogynous 3. Haplariopsis. 

 Conidia solitary, acrogenous 

 or capitate 

 Conidia capitate at apex. . . 4. Cephalothecium, p. 586. 

 Conidia solitary at apex 



Fertile hyphae long 5. Trichothecium. 



Fertile hyphae very short 6. Didymopsis. 

 Fertile hyphae branched 



Branching irregular 7. Diplosporium. 



Branching verticillate 8. Diplocladium. 



Branching dichotomous; sterig- 



mata subtemate 9. Cylindrocladium. 



Conidia echinulate; conidial cells un- 

 equal 10. Mycogope, p. 587. 



Biophilous 



Conidia obliquely beaked 11. Rhynchosporium, p. 587. 



Conidia not beaked 

 Hsnph* mostly simple, not spirally 



twisted. 12. Did]rmaria, p. 587. 



Hyphae simple, spirally twisted. . . 13. Bostrichonema. 

 Conidia catenulate 



Fertile hyphae simple, short 14. Honniactis. 



Fertile hyphae verticillately branched. . 15. Didymocladium. 



Cephalothecium Corda 



Hyphae prostrate; conidiophores erect, 

 simple, septate, conidia apical, subcapi- 

 \* / ^-i_ _->' tate, oblong to pyriform, hyaline. 

 Five species, chiefly saprophytes. 

 C. roseum Cda.=^263 



Cespitose in subrotund, rose colored 



spots, fading with age, byssoid; hyphae 



FiQ. 392.— Spores of Cepha- Creeping, branched; conidiophores erect, 



ES^telr ""'""'■ ^"" simple, continuous, hyaline; conidia 



oblong-ovate, constricted at the septum, 



capitate, light rose. 



It is often found following apple scab gaining entrance through 



