Family 2. TILLETIACEAE 



By Gkorgk Perkins Clinton 



Sori either forming dusty erumpent spore-masses or else permanently im- 

 bedded in tlie tissues. Germination by means of a short promycelium which 

 usually gives rise to a terminal cluster of elongate sporidia that, with or with- 

 out fusing in pairs, produce similar or dissimilar secondary sporidia or germi- 

 nate directly into infection-threads. 



Spores single. 



Sori dusty at maturity. 



Spores without a conspicuous hyaline appendage. 

 Spores with an elongate hyaline appendage. 

 Sori permanently imbedded in the tissues. 

 Spores in balls. 



. Sori dusty ; spore-balls with sterile cortex. 

 Sori rather permanently embedded in tissues. 

 Spore-balls without sterile cortex. 



Spore-balls consisting entirely of dark-colored spores. 

 Spore-balls consisting of light-colored spores. 



Spore-balls with or without central sterile cells. 

 Spore -balls with central network of filaments. 



Spore-balls with sterile cortex. 



1. TiLLETIA. 



2. Neovossia. 

 5. Entyloma. 



4. Urocystis. 



3. tuburcinia. 



6. burrillia. 

 8. Tracya. 



7. Doassansia. 



1. T. foe tens. 



2. T. Triiici, 



3. T. Ely mi. 



5. 



4. 



8. 



10. 



T. Muhlenhergiae 

 T. Anthoxanthi. 

 T. fusca. 

 T. Redfieldiae. 



1. TILLETIA Tul. Ann. Sci. Nat. III. 7: 112. 1847. 



Sori in various parts of the hosts, usually in the ovaries, forming a dusty spore-mass ; 

 spores single, usually formed singly in the ends of the mycelial threads that disappear 

 more or less completely through gelatinization, of medium to large size ; germination 

 usually by a short promycelium which bears a terminal cluster of elongate sporidia that 

 with or without fusing in pairs may, in nutrient solutions, give rise to a considerable 

 mycelium bearing secondary air-sporidia. 



Type, Uredo Caries DC. 



Spores smooth. 

 Spores reticulate. 



Sori 5-8 mm. in length. 



Spores 16-22 iu- in length. 



Spores 23-28 \t. in length. 



Sori 3-5 mm. in length. 



Sterile cells chiefly thin-walled ; smaller than spores. 



Spores 28-34 a* m length. 

 Spores chiefly 25-30 m in length. 

 Spores chiefly 20-25 m- in length. 

 Sterile ceHs with very thick walls (3-6/*) ; larger than spores. 



Sori 1 or 2 mm. in length. 



Sterile cells chiefly thin-waUed ; smaller than spores. 

 Spores chiefly 25-30 /x in length. 

 Reticulations chiefly cerebriform. 

 Reticulations polygonal. 

 Spores 17-25 iu. in length. 

 Sterile cells very thick-walled (3-8 m) ; larger than spores. 



Spores apparently verruculose. 

 Spores with prominent tubercles, spines or scales. 

 Sori in the culms. 

 Sori in the ovaries. 



Spores chiefly 18-25 ^^ in length. ^ ^ ,- i ^^ 



Spores without pedicel-like projection of hyaline envelope. 



Spores with prominent tubercles. 

 Sori 3--5 mm. in length. 

 Sori about 1 or 2 mm. in length. 



Mature spores ? but slightly tinted. 

 Mature spores chocolate -brown . 

 Host : Bulbilis {Buchloe) . 

 Host : Cathestecum. 

 Snores with coarse scale-like appendages. 

 Spores with pedicel-like projection of hyaline envelope. 



VOI.UME 7, Part 1, 1906] 



6. 



7. 



9. 

 11. 

 12. 



T. cerebrina. 

 T. Airae. 

 T. montana. 

 T. asperifolia. 

 T. Maclagani. 



13. T. Ear lei. 



14. T. texana. 



15. T. Wilcoxiana 



16. T. huchloeana. 



17. T. Caihesteci. 

 19. T. rugispora. 



18. T. corona. 



47 



