Part 1, 1906] ' USTILAGINACBAB 5 



B. Spores yellow or golden-brown. 



Spores smootH or obscurely echinulate, 7-12 i^ in length. 59. u. Vaillanth 



Spores coarsely verrucose, 13-20/. in length. 60. U. Oxalidis, 



C. Spores violet or purplish. 



Spores very minutely and obliquelj^ striate. 



Hosts: Macounasirum {Koenigia). 69. U. Koeni^iae. 



Hosts: Polygonum. 70. U. Piperii. 



Spores minutely verruculose. 72.' if. Bisioriarum 



Spores though appearing smooth very minutely pitted-reticulate. 11. U. punctata. 

 Spores with winged reticulations. 



Sori in stems, petioles and midribs. 68. U. Parlatorei. 



Sori in inflorescence and floral axis. 67. U. Rumicis. 



Sori in flowers or their organs. 



Sori in ovaries and often stamens, inclosed by floral envelopes. 



Spores small, 7-10 m, minutely reticulate (l/i). 61. U. vinosa. 



Spores medium, 10-14 ja in length. 



Spores light-violet, rather finely reticulate (1-3 /n). 65. U. anomala. 



Spores purplish ; reticulations coarser (2-4^). 66. U. utriculosa. 



Spores medium large, 14-17 /i ; reticulations 1.5-2 ha. 64. U .■ Calandriniae . 



Sori in anthers. 62. U. violacea. 



Sori in seeds ; spores 12-18 ju. ; reticulations about 1 /x. dl. U. Gayophyti. 



1. Ustilago minima Arth. Bull. Iowa Agr. Coll. Dep. 



Bot. 1884: 172. 1884. 



Sori on stems, linear, usually 3-5 cm. in length, with a conspicuous whitish false mem- 

 brane composed chiefly of elongated sterile fungous threads, upon rupture disclosing a dusty 

 black-brown spore-mass surrounding stem as columella ; spores light reddish-brown, chiefly 

 ovoid to subspherical or spherical, smooth, 3.5-4.5^, or elongate, 5.5 /i, in length. 



On Poaceae : 



Eriocoma cuspidata {Oryzopsis cuspidata), Arizona. 



Stipa spartea^ Iowa, South Dakota. 

 Type locality : Ames, Iowa, on Stipa spartea. 

 Distribution : Iowa, South Dakota and Arizona. 

 BxsiccATi: Seym. & Barle, Econ. Fungi C70; Griff. West Am. Fungi 2J7. 



2. Ustilago hypodytes (Schlecht.) Fries, Syst. Myc. 3 : 518. 1832. 



Caeoma hypodytes Schlecht. Fl. Berol. 2 : 129. 1824. 



Ustilago Sporoboli igllis & Bv. Bull. Torrey Club 24 : 282. 1897. (Type from Colorado, on Sporo- 



bolus cryptandrus.) Not U. Sporoboli Tracy .& Earle, 1896. 

 Ustilago funalis KHis & Kv. Bull. Torrey Club 24 : 457. 1897. 

 Sorosporium Williamsii Griff. Bull. Torrey Club 29 : 296. 1902. (Type from Wyoming, on Stipa 



Richardsonii. ) 



Sori surrounding internodes (beginning at their bases) for usually the greater part of 

 their length, linear, hidden by enveloping leaf-sheaths but without special covering mem- 

 brane, when mature forming a dusty dark-brown spore-mass ; spores ovoid to spherical, 

 occasionally slightly polyhedral or irregular, smooth, often guttulate, chiefly 4-7 /^ in length. 



On Poaceae : 



Agropyron occidentale, Montana, South Dakota. 



Distichlis spicata {D. maritima') , Arizona, California, Connecticut, Nevada, New Mexico, 



Oregon, Texas, Washington. 

 Elynius canadensis^ Iowa. 



Elymus condensaius, California, Nevada, Oregon, Washington, 

 Elymus glaucus^ California. 

 Elymus striatus^ Montana. 

 Eriocoma cuspidata iOryz op sis cuspidata'), Colorado. 



Poa Buckleyana,^ Nevada. 



Puccinellia airoideSy California. 



Sitanion longifolium, California, Washington. 



Sporobolus cryptandrus, Colorado. 



Sporobolus s^., California. 



Stipa comata, Montana, Nebraska, Washington. 



Stipa coronata, California. 



Stipa eminens, California. 



Sttpa occidentalism Oregon. 



Stipa Richardsonii, Wyoming. 



Sttpa setigera, California, Texas. 



Sttpa spartea, Illinois, South Dakota. 



Sttpa Vaseyi, New Mexico. 



Stipa viriduM^oxi\M. Dakota. 



Sttpa sp.,y?7Tag^Washington. 



