Arthur: Uredinales of Porto Rico 91 



101. Uredo Clusiae sp. nov. 

 On Guttiferae: 



Clusia rosea Jacq., Maricao, mountains along Rio Grande, 

 March 22, 57/. 



Uredinia hypophyllous, scattered, mammilliform, 0.3-0.6 mm. 

 across, dark brown, opening by a central pore or rupture, sub- 

 epidermal, deep-seated; urediniospores obovoid or ellipsoid, 19-23 

 by 28-35 /x; wa U n ? nt yellow, about 1.5 fi thick, sparsely and 

 strongly echinulate, the points being 1-2 /x long and about 3 fx 

 apart. 



The large thick leaves of the host readily show the numerous 

 sori. Sections show that the sorus is formed well down in the 

 tissues, apparently below one or more layers of the mesophyll 

 underneath the epidermis. It was not possible to be quite certain 

 about a peridium, but there may be one having rhomboidal cells, 

 that are verrucose on the inner side. The spores have a con- 

 spicuous echinulation, which with the absence of demonstrable 

 pores and the general character of the sorus indicates a possible 

 relationship to Cronartium. 



102. Uredo Bixae Arth. 

 On Bixaceae : 



Bixa Orellana L., Maricao, March 25, 326. 

 The paraphysate structure has not been well made out in the 

 species, but appears to be an imbricated pseudoperidium. 



103. Uredo Gymnogrammes P. Henn. 

 On Polypodiaceae : 



Adiantum latifolium Lam., Mayagiiez, March 6, 2, March 

 10, 3. 



Dryopteris mollis (Jacq.) Huron, Mayagiiez, March 6, 4. 

 Dryopteris Poiteana (Bory) Urban, Mayagiiez, March 6, 



7, March 13, 8, March 20, p; Maricao, March 24, 10. 

 Gomiopteris guadahipensis Fee, Mayagiiez, March 3, 1. 

 Pityro gramma calomelaena (L.) Link, Maricao, March 



16, 5- 



Tectaria Martkniensis (Spreng.) Copel, Mayagiiez, March 

 6,6. K 

 The species is known also from Cuba and Jamaica. The first. 



