ON LEGUMIXOS.i; 



99 



18. Uromyces Orobi Lev. 



JScidiwm Orobi Pers. in Rom. Neu. Magazin, i. 92. Cooke, Handb. 



p. 542 ; Micr. Fung. p. 1!>7. 

 Uromyces Orobi Lev. Ann. Sci. Nat. ser. 3,'viiL 371, 376. Plowr. Ured. 



p. 121. Sydow, Monogr. ii. 106. Fischer, Ured. Schweiz, p. 69, 



f. 



.)!' 



Spermogones. Hypophyllous, mixed with the secidia. 



jEcidiospores. /Ecidia hypophyllous, on yellowish spots, in 

 dense clusters 1 — 5 mm. long, rarely soli- 

 tary, shortly cup-shaped, with whitish revo- 

 lute margin ; spores densely and minutely 

 verruculose, yellowish, 14 — -21 /x. 



Uredospores. Sori amphigenous, scat- 

 tered, minute, punctiform, pulverulent, 

 brown ; spores globose to ovate, distantly 

 echinulate, pale-brown then darker, 20 — 

 28 x 18 — 25 /x: epispore 3 — 4/u, thick, with 

 three or four germ-pores. 



Teleutospores. Sori similar, but darker; 

 spores subglobose to ovate, rounded or sub- 

 conical above, and much thickened (7 — 11 /x) and darker, smooth, 

 brown, 25—35 x 18 — 28 ft; pedicels persistent, yellowish, thick, 

 as much as 100 n long. 



On Orobus tuberosus (Lathyrus montanus = L. macrorrhizus). 



iEcidia in May and June ; uredo- and teleutospores from June 

 onwards. (Fig. 53.) 



Cooke says that the secidia also occur on the stems. The thicker 

 membrane of the uredospores, which is also less strongly echinulate, 

 distinguishes them from those of U. Fabae. Jordi made attempts to 

 infect various other species of Lathyrus, and also species of Vicia and 

 Pisum, from U. Orobi, but in every case without success. 



Distribution : North-western and Central Europe. 



Fig. 53. U. Orobi. 

 Teleutospores on 

 0. tuberosus. 



14. Uromyces Pisi Wint. 



Uredo appendiculata var. Pisi Pers. Obs. Myc. i. 1' 

 JEcidium Cyparissiae DC. Flor. fr. ii. 240. 

 Uromyces Lathyri Fckl. Symb. Myc. p. 62. 



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