60 



Mycologia 



Schro^teriaster. The type species of Phako psora possesses a • 

 membranous peridium with paraphyses intermixed with the 

 spores of the uredinium, while the type of Schroeteriaster is 

 without peridium or paraphyses, and with colored spores, having 

 evident pores. All three genera show lenticular telia in their 

 types. 



The writer does not wish to express an opinion as to the correct 

 limitations of the genus Physopella, or even of its validity, but 

 thinks it best to assort species into genera representing like 

 groups, so far as that is possible. Too few species are yet known 

 with both uredinia and telia, and too great obscurity yet exists 

 regarding the life cycle of these forms to make a fully rational 

 and workable assortment of the various forms possible. 



6. Physopella concors (Arth.) comb. nov. 



Uredo concors Arth. Mycol. 7: 330. 1915. 

 On Fabaceae: 



Dolichos Lablab L., El Yunque, April 14, II, 197. 



The general characters of this rust so closely resemble those of 

 P. Meibomiae, that since becoming acquainted with that species 

 there seems not to be the slightest chance for error in transferring 

 the rust from the form-genus Uredo to the genus Physopella. 

 Both macroscopically and microscopically the two forms are, how- 

 ever, thoroughly distinct specifically. The telia of P. concors, 

 which have not yet been found, are likely to occur, as in P. Mei- 

 bomiae, among well-matured uredinia, but a diligent search 

 of the material in hand did not reveal them. 



Olivea gen. nov. 



Cycle of development includes pycnia, aecia, uredinia, and telia ; 

 autoecious. Aecia subepidermal, other sori subcuticular. 

 - Pycnia mammilliform, without estiolar filaments. 



Aecia deep-seated, protected by the host tissues. Peridium 

 apparently wanting. Aeciospores catenulate with intercalary 

 cells, obovate, strongly echinulate-verrucose, with rod-like warts, 

 the walls colored ; in appearance simulating urediniospores. 



Uredinia from a minute, subcuticular hymenium, expanding 

 into a globose mass of strongly incurved paraphyses, having their 

 bases united. Urediniospores borne singly on pedicels, obovate, 

 stellately angular, echinulate, the wall colored, with pores ap- 

 proximately equatorial, at the angles. 



