316 EXPERIMENT STATION RECORD. 



BOTANY. 



Review of the investigations of the grain rust, J. Eriksson (Ber. 

 Andra Nord. Landtbr. Kongr., Stockholm, 1897, I, pp. 94-109; also Bot. 

 Gaz., 25 (1898), No. 1, pp. 26-38, and Rev. Gen. Bot, 10 (1898), No. 110, 

 pp. 33-48, fig. 1). — The paper gives the main results of the investiga- 

 tions of the grain rust conducted by the author since 1890 at the State 

 agricultural experiment station at Albano, Sweden. The conclusions 

 to which the results have led are summarized as follows: 



The fungi which cause rust disease in the cereals are at least 10 in 

 number, partly species, partly specialized forms of species, and the 

 spreading of disease between different grain crops and grasses is 

 thereby materially restricted. Prior to 1890 the recognized species of 

 grain rnst fungi were the common grain rust, Pvccinia graminis, the 

 secidial form of which was JEcidium berbcridis; smaller grain rust, P. 

 rubigo-vera, secidial form JE. asperifolii; and crown rust, P. coronata, 

 a'cidial form JZ. rhamni. The author recognizes 8 species, having 

 divided them as follows: P. graminis into (1) P. graminis and (15) P. 

 phlei-pratensis; P. rubigo-vera into (3) P. glumarum, (1) P. dispersa, and 

 (5) P. simplex; and P. coronata into (0) P. coronifera, (7) P. Coronata, 

 and (8) an unnamed species. Each of these is considered to have 

 developed specialized forms as follows: 



(1) P. graminis, black rust, JEcidium berberidis. — Eorms (a) secalis 

 on Secale cereale, Hordeum vulgare, H. jubatum, Triticum caninum, T. 

 desertorum, T. repens, Elymus arenarius, and Bromus secalinus; (b) avence 

 on Avena sativa, A. elatior, A. sterilis, Dactylis glomerata, Alopecurus 

 pratensis, Milium effusum, LamarTcia a area, and Trisetum distichophyl- 

 lum; (c) tritici on Triticum vulgare; (d) airce on Aira ccespitosa; (e) 

 agrostidis on Agrostis cania, A. stolonifera, and A. vulgaris; and (/) 

 pocv on Poa compressa and P. ca'sia. 



(2) P. phlcipratcnsis, timothy rust, on Phleum pratense and Festuca 

 elatior, secidium unknown. 



(3) P. glumarum, yellow rust. — Forms (a) tritici on Triticum vulgare, 

 (b) secalis on Secale cereale, (c) hordei on Hordeum vulgare, (d) elyml 

 on Blymus arenarius, and (e) agropyri on Triticum repens, secidium 

 unknown. 



(4) P. dispersa, brown rust, JEcidium anchusce. — Forms (a) secalis on 

 Secale cereale, (b) tritici on Triticum vulgare, (c) agropyri on T. repens, 

 and (d) bromi on Bromus arvensis and B. brizivformis. 



(5) 7'. simplex, dwarf rust, on Hordeum vulgare, ascidium unknown. 

 (0) P. coronifera. crown rust, ^Ecidium cafhartica. — Forms (a) arena 1 



on Avena sativa, (b) alopecuri on Alopecurus pratensis and A. nigricans, 

 (c)festucw on Festuca elatior, (d) lolii on Lolium perenne, (e) glyceriw on 

 Glyceria aquatica, (/) hold on Holcus lanatus and H. mollis. 



(7) P. coronata, crown rnst, JEcidium frangulce. — Forms (a) calama- 

 grostis on Calamagrostis arundinacea and C. lanceolata, (b) plialaridis 



