Arthur: Uredinales of Porto Rico 



87 



Secanquim, Depart. Alta Verapaz, Guatemala, Jan. n, 1905, 

 Max on & Hay 323$, and Aspinwall, Panama, Oct. 1859, Sutton 

 Hays 868. 



89. Pucciniosira pallidula (Speg.) Lagerh. 

 On Tiliaceae : 



Triumfetta semitriloba L., Mayagiiez, Feb. 29, 108, March 

 1-8, 107; Maricao, March 7, 105; Yauco, March 31, 

 106. 



90. Botryorhiza Hippocrateae Whetzel & Olive, Am. Jour. 



Bot. 4: 47. 1917. 

 On Hippocrateaceae : 



Hippocratea volubilis L., Mayagiiez, March 1, 3, 27, 87, 

 March 7, 88, March g, 89; Barceloneta, April 6, 00; Rio 

 Piedras, April 4, 21, pi; El Yunque, April 12, 02. 

 The structure of this rust is in many ways quite aberrant. No 

 other telial form is known having a Uredo -like sorus. The white, 

 conidia-like spores, produced in great abundance, remind one of 

 certain phycomycetous fungi. The grouping of the sori on small 

 hypertrophied areas, or uniformly over much drawn and etiolated 

 shoots, agrees well with some rusts, i. e., the short cycle Puccinia 

 obliqua on asclepiads, or the aecia of Puccinia Rivinae. The 

 careful and conclusive studies by Messrs. Whetzel and Olive 

 warrant us in believing this to be a genuine rust. Its further 

 study and the search for related forms are likely to give another, 

 and possibly new, angle from which to interpret the evolution of 

 the Uredinales. 



Form-genus : Aecidium 



All of the forms listed here probably belong to heteroecious 

 species under Aecidiaceae. The spores of each form have been 

 tested by the collectors and found to germinate in a moist atmos- 

 phere by the production of long hyphae without showing pro- 

 mycelial tendency. 



91. Aecidium passifloriicola P. Henn. 

 On Passifloriaceae : 



Passiflora rubra L., Mayagiiez, March 8, 59; Maricao, 

 March 16, 60. 



