92 Jouryial of Mycology [Vol. 13 



understood of course that the application of the rule of priority 

 has brought the real generic name Uredo uppermost. Our spe- 

 cies then are as newly denominated: Uredo medusae (Thuem.) 

 Arthur; Uredo contluens (Juel) Arthur; Uredo rostrupiana 

 Arthur; Uredo bigelowii (Thuem.) Arth. ; Uredo albertensis 

 Arthur ; and Uredo lini Schum. 



The second genus of this family, Physopella, includes the 

 Uredo vitis Thuem., Uredo ficina Juel, Uredo fici Cast., Uredo 

 artocarpi B. & C, and Uredo aeschynomenis Arth. The third 

 genus, Bubakia, was based on Thichobasis crotonis Cooke ; and 

 one more species of our flora is added, namely, Bubakia mexi- 

 cana Arthur n. sp. 



The three genera just enumerated constitute the subfamily 

 Uredinatae — having their pycnia and other sori subcuticular or 

 originating between the epidermis and mesophyll ; the teliospores 

 compacted into dense layers forming a crust ; aecia when present 

 with periderm. The next seven genera (Nos. 4-10 of this 

 family) form the subfamily Pucciniastratac — having subcuticu- 

 lar pycnia but the other sori originating between the epidermis 

 and mesophyll ; teliospores divided by vertical partitions or one- 

 celled, forming imperfect layers, or solitary ; aecia when present 

 with cylindrical periderm, rupturing irregularly above. The 

 members of this subfamily are enumerated in the next para- 

 graph. 



The genus Pucciniastrum Otth, established in 1861, is re- 

 tained, the genera proposed by Mganus in 1875, Phragmopsora 

 and Thekopsora, being listed as synonyms. Under this we find 

 the forms well known in literature as Uredo goodyerae Tranz., 

 Uredo hydrangeae B. & C, Uredo agrimoniae Schw., Uredo arc- 

 ticus Lagerh., Uredo pustulata Pers. (and Melampsora epilobii 

 Fckl.), Aecidium pyrolae Pers. (Melampsora pirolae Schroet. 

 and Uredo chimaphilae Peck)_, Melampsora sparsa Wint. (Puc- 

 ciniastrum arbuti D. & H. and Uredo copelandi Syd.), Uredo 

 minima Schw. and Caeoma azaleae Schw., and Aecidium ( ?) 

 myrtilli Schum. (Melampsora vaccinii Wint.). The last named 

 species may be taken as a fair case to display the usual synonomy 

 that thorough study develops. The name is used in the mono- 

 graph is Pucciniastrum myrtilH (Schum.) Arth. 1906; the syn- 

 onyms being : 



Aecidium ( ?) myrtilli Schum.. 1803. 

 Uredo pustulata vaccinii Alb. & Schw., 1805. 

 Uredo vacciniorum DC, 181 5. 

 Caeoma vacciniorum Link. 1825. 

 Thecopsora ( ?) vacciniorum Karst., 1879. 

 Melampsora vaccinii Wint.. t88i. 

 Melampsora vaccinionnn Schroet., 1887. 

 Pucciniastrum vacciniorum Dietel, 1897. 



