Part 1, 1906] USTILAGINACEAB 37 



1. Mykosyrinx Cissi (DC.) G. Beck, Ann. Nat. 



Hofmus. Wien 9 : 123. 1894. 



Uredo Cissi DC. in Poir. Encycl. Meth. Bot. 8 : 228. 1808. 



Germnella exotica Schrot. Hedwigia 15 : 135. 1876. (Type from Brazil, on Cissus sicyoides.) 



Geminella exotica Decandollei Fisch de "Waldh. Apergu Syst. Ust. 43. 1877. 



Schroeteria Cissi De-Toni ; Sacc. Syll. Fung. 72 : 501. 1888. 



Sori in peduncles and pedicels of the inflorescence, distorting the infected parts some- 

 what and filling their interior with a dusty purple-black spore-mass ; spores dark reddish- 

 brown, subopaque, chiefly subspherical, spherical, or occasionally slightly angled, two- 

 celled, with a common enveloping outer membrane which ruptures at juncture of cells 

 allowing these to separate at their margins though still attached at the bulging centers, 

 smooth, about 11-14 ," (individual cells) in length. 



On Vitaceae : 



Cissus acida, Porto Rico. 



Cissus erosa, Porto Rico. 



Cissus sicyoides, Florida ; Bahamas ; Jamaica; Porto Rico ; San Domingo. 



Cissus ST^., Cuba; Dominica; Mexico. 



Vitaceae, Haiti ; Mexico. 

 Type locality : San Domingo, on Cissus sicyoides. 



Distribution : Florida; Mexico ; West Indies; also in South America and Africa. 

 Illustrations : Malpighia 13 : 522-530 ; Ann. Nat. Hofmus. Wien 9 : pi. 2 J. 3. 

 KxsiccATi : Krypt. Exs. Kd. Mus. Pal. Vind. 11 ; Sydow, Ust. 48. 



7. SOROSPORIUM Rud. I^innaea 4 : 116. 1829. 



Sori in various parts of the host, forming dusty dark-colored spore-masses ; spore-balls 

 composed of numerous fertile cells, often rather loosely united and frequently at maturity 

 completely separating, of medium size ; spores usually olive- or reddish-brown, of medium 

 size ; germination similar to that of Ustilago, sometimes with elongate germ-thread and no 



sporidia. 



Type, Sorosporium Saponariae Rud. 



Sori in the ovaries, usually small. 

 Spore-balls quite temporary. 



Spores 6-9 ^ in length. 1- S. consangutneum , 



Spores ll-16(Lt in length. 2. 5. Eriochloae. 



Spore-balls rather permanent. ^ r^ ^ , _, . - 



Spores 8-12 p., light reddish-brown. 3. 5. Eyerharttt. 



Spores 10-16 M, dark reddish-brown. 9- 5. Rhynchosporae . 

 Sori aborting the inflorescence, very elongate. 

 Spore-balls composed of many spores. 

 Spores rather thin-walled. 

 Spores 9-13 ** in length. 



Spores chiefly smooth. 4. i. coniortum. 



Spores chiefly verruculose. 5. S Syniherismae . 



Spores 12-19^1 in length. 6. 5. Emsit. 



Spores rather thick-walled (3 ^) . 7. S provtnciale . 



Spore-balls of few spores, usually 6-20. 8. 5. granulosum. 



1. Sorosporium consanguineum Ell. & Ev. Jour. Myc. 3: 56. 1887. 



Usiilago Aristidae Peck, Bull. Torrey Club 12 : 2>5. 1885. (Type from Texas, on Aristtda sp.) 

 ?Not Sorosporium Aristidae Neger. 1896. 



Sori in ovaries, entirely enclosed by glumes though often somewhat visible through 



these; spore-baUs oblong to subspherical, more or less irregular, at first firm but with age 



usually becoming entirely dissolved, about 80-135 (i in length ; spores reddish-brown, ovoid 



to subspherical but chiefly polyhedral, smooth, mostly 6-9 (i in length. 



On Poaceae : . x, i. •^ a ■ 



Aristida arizomca {A. Rusbyt), Arizona. 



Aristida basiramea, South Dakota. 

 Aristida longiseta {A . purpurea) , Nebraska. 

 Aristida longiseta robusta, Nebraska. 

 Aristida purpurascens , Colorado. 

 Aristida Schiedeana, Arizona. 



Aristida sp., Kansas, Texas ; Mexico. z.-,,,^ • •^^ 



Type locality: Northern Arizona, on " Aristida Rusbyt " {A. artzomca). 



DISTRIBUTION : South Dakota to Mexico. 



