120 



Mycologia 



17. Ravenelia Mimosae-albidae Diet, (on Mimosaceae) 

 Mimosa albida H.B.K., San Jose, Dec. 27, 191 5, II 2 , 302. 

 The species is also known from Guatemala and Mexico. 



18. Ravenelia ectypa Arthur & Holway sp. nov. (on 

 Mimosaceae) 



Calliandra gracilis Klotsch, San Jose, Dec. 26, 191 5, II, III, 206. 



Uredinia amphigenous, scattered or somewhat grouped, round, 

 0.5-1 mm. across, early naked, subcuticular, pulverulent, cin- 

 namon-brown, ruptured cuticle evident ; paraphyses none ; ure- 

 diniospores broadly ellipsoid or obovoid, 17-19 by 19-26^; wall 

 golden-brown, uniformly thin, 1 \x, moderately echinulate, the 

 pores 6 or 7, scattered. 



Telia amphigenous, scattered, round, 0.4-1 mm. across, early 

 naked, subcuticular, dark chestnut-brown, ruptured cuticle evi- 

 dent; teliospore-heads hemispherical, usually consisting of four 

 central and six marginal spores, 42-60 /x in diameter, each spore 

 bearing 4-12 light brown spines, 3-5 /x long; cysts attached to the 

 lower side of the marginal spores. 



This species approaches R. echinata Lagerh. & Diet., but has 

 larger urediniospores and smaller teliospore-heads. In R. echi- 

 nata the heads have 6 central and 8 marginal spores, while in this 

 species there, are 4 central and 6 marginal spores. 



19. Ravenelia Humphreyana P. Henn. (on Caesalpiniaceae) 



Poinciana pulcherrima L., Orotina, Dec. 30, 191 5, II 2 , 328. 



A common long-cycle rust of the West Indies, Guatemala and 

 Mexico. 



20. Calliospora Diphysae Arth. (on Fabaceae) 

 Diphysa robinoides Benth., Heredia, Dec. 17, 1915, O, III, 2/0; 



San Jose, Dec. 28, 191 5, O, III, 310. 

 Diphysa sp., Orotina, Dec. 31, 191 5, O, III, 336. 



Heretofore this short-cycle rust has been known from Mexico 

 and Guatemala. 



21. Prospodium appendiculatum (Wint.) Arth. (on 



Bignoniaceae) 



Stenolobium Stans (L.) D. Don (Tecoma Stans Juss.), San 

 .Jose, Dec. 28, 1915, III, 300. 



