' FUNGOUS PAEASITES. 75 



upland ranges are singularly free from pests of this sort, but in the 

 nioister bottom lands many of the common grass-inhabiting species of 

 rusts and smuts are found. 



Ustilago avence (Pers.) Jensen, oat smut, is seldom absent from 

 fields of cultivated oats, and in certain seasons is said to cause con- 

 siderable injury. It is occasionally found on the wild oats. 



Ustilago liolwayi, Diete.1., is frequently found on Hordeum nodosum, 

 but can scarcely be considered a pest. 



Ustilago bromivora, Fisch. , is found on Bromus hordeaceus glabres- 

 cens, but is not widely distributed. 



Puccinia rubigo-vera (D. C.) Wint., orange leaf rust, is not un- 

 common on Bromus secalinus and B. carinatus, but the amount of 

 injury effected by it is not great. 



A yellow-spored Uredo is almost constantly associated with Holcus 

 lanatus, and, were this grass a more A r aluable one, the rust might be 

 considered a serious pest. Observations on this species in other por- 

 tions of the State have shown that it persists throughout the year with- 

 out the formation of other spore forms, which renders its identification 

 impossible. 



Uromyces minor, Schroet., clover rust, frequently injures certain 

 species of Trifolium, especially T. dubium and T. microdon. In other 

 portions of the State it is especially injurious to T. gracilentum. 



What is probabl}' the uredo stage of Uromyces striatus, Schroet., 

 was also found in abundance in a single locality on Medicdgo 

 lupulina. 



Pseudopeziza trifolii, Fckl., is widely distributed and injures 

 nearly all the species of Trifolium, but especially T. cyathiferum and 

 T. microdon. 



The species enumerated below are of frequent occurrence, though 

 of no special economic significance: JEcidium sommerfeltii Johan- 

 son, on Aquilegia truncaia; JEcidium liydropliylli Peck, on Hydro- 

 phyllum capitatum; JEcidium pseudo-balsameum D. and H., on Abies 

 grandis; Actinonema rosae (Lib.) Fr., on Rosa gymnocarpa; Doas- 

 sansia alismatis (Nees) Cornu, on Alisma planiago; Puccinia 

 circcece Pers., on Circcea pacifica; Puccinia densa D. and H., on 

 Viola glabella; Puccinia bistorts (Strauss) Wint., on Polygonum bis- 

 tortoides; Puccinia asari Link, on Asarum caudatum; Puccinia 

 gentianw (Strauss) Link, on Gentiana menziesii; Puccinia malva- 

 cearum Mont., on Althcea rosea and Malva sp. ; Puccinia menthcz 

 Pers., on Micromeria douglasii and Monar delta undidata; Puccinia 

 mesnieriana Thuem., on Rhamnus crocea; Puccinia nodosa Ell. & 

 Hark., on Brodiaza capitata; Puccinia melanconioides Ell. & Hark., 

 on Dodecatheon cruciatum; Puccinia mirabilissima Peck, on Berberis 

 nervosa; Puccinia liieracii (Schum.) Mart., on Carduus lanceolatus; 

 Puccinia plumbaria Peck, on Phlox gracilis; Puccinia symphoric a r pi 

 Hark., on Symplioricarpus mollis; Puccinia pimpinellcz (Strauss) 



