Arthur: Uredinales of Costa Rica 



145 



slightly striate, the pore of lower cell near the pedicel; pedicel 

 short, fragile, colorless. 



This appears to be the correlated short-cycle form for Puccinia 

 proba Jacks. & Holw. Its spore structures are morphologically 

 nearly or quite identical with those of that species. 



102. Puccinia Oyedaeae Mayor (on Carduaceae) 

 Oyedaea acuminata (Benth.) Benth. & Hook, f., Tres Rios near 

 San Jose, Dec. 20, 1915, O, I, II, III, 274; San Jose, Jan. 3, 

 1916, O, I, II, 356. 



The species was founded on a telial collection from Colombia, 

 S. A., the host being an undetermined species of Oyedaea. It 

 was classed as one of the Leptopuccinias. Prof. Holway's col- 

 lections, the first for North America, supply all the other stages, 

 which may be characterized as follows. 



Pycnia epiphyllous, in small groups, chocolate-brown, conspicu- 

 ous, subepidermal, globoid, 112-128/* in diameter. 



Aecia epiphyllous, associated with the pycnia in groups 0.3-2 

 mm. across, cupulate ; peridium white, erose ; peridial cells linear 

 oblong, 5-7 by 26-35 /x, abutted, the walls 1. 5-2 /x thick; aecio- 

 spores broadly ellipsoid, 23-26 by 26-32 /x ; wall yellowish, 3 fx 

 thick, thickening up to 4-7 fx at apex, closely tuberculate-verru- 

 cose. 



Uredinia hypophyllous, scattered, round, 0.1-0.4 mm. across, 

 early naked, pulverulent, dark cinnamon-brown, ruptured epi- 

 dermis inconspicuous ; urediniospores globoid or broadly ellipsoid, 

 23-27 by 26-32 /jl ; wall dark cinnamon-brown, thick, 2.5-3 /*> closely 

 echinulate, the pores 6-10, scattered. 



Excellent drawings of the long and narrow teliospores are given 

 by Mayor (Mem. Soc. Neuch. Sci. Nat. 5:535. 1913). These 

 are strongly thickened at the apex, and of a decided brown color, 

 becoming nearly or quite colorless below. 



103. Puccinia Caleae Arth. (on Carduaceae) 

 Calea urticifolia (Mill.) DC, San Jose, Dec. 10, 1915, ii, III, 243 • 

 same, Jan. 3, 1916, III, 349; same, O, I, II, 357; Heredia, 

 Dec. 17, 1915, II, III, 265; Orotina, Dec. 31, 1915, II, III, 

 339- 



A long-cycle rust, occurring also in Guatemala and Mexico. 



