9 2 B AS IDIOM YCE TES 



7. Endospore of teleutospore becoming mucilaginous and swollen in water; 



(parasitic on Leguniinosae). Phragmopyxis. 



Endospore of teleutospore without a mucilaginous layer; (parasitic on 



Rosaceae). Phragmidium.* 



Of the above genera Puccinia contains about three hundred 

 species within our limits and LVofnyces about one hundred. Uro- 

 Pyxis'^ and Phragjjwpyxis each contain a single species, the for- 

 mer on Amorpha and the latter on a Texan leguminous plant of 

 unknown genus. Gymiiocoiiia is the cause of the common black- 

 berry or raspberry rust which is e\erywhere abundant causing 

 whole plants to be covered in spring with the bright orange sori 

 of the aecidial stage of the fungus f Triphragmiuni is a small 

 genus (/y. 6. f. if), one of the best known species being found on 

 Aralia niidicaiilis but this does not seem to appear below a 

 certain altitude. 



P/waginidiuni has several species on Rosa, Potentilla and Riibiis, 

 the species on cultivated roses being very abundant in some 

 localities and often causing considerable damage {PL 6. f. 14). 



Raveiielia has several American species mostly on members of 

 the Leguminosae {PI. 6. f. 11, 12). 



Besides the genera above named there is a large residue of im- 

 perfect forms that must remain in the various form-genera until 

 their true relations are known. The greater part of these are 

 cluster-cups belonging to the genus Accidiuni whose characters 

 have been already set forth {PL 6. f. iS). Others for the same 

 reason must stand in Rocstelia. Some aecidial forms without a 

 pseudoperidium belong to the genus Caeonia. A tew isolated 

 forms represent the uredo stage and these must remain in like 

 manner in the genus Urcdo. Among these is Uredo ficiis which 

 causes the rust of the fig. 



not the place to introduce novelties in generic nomenclature nor to adopt 

 names that have not been somewhat generally adopted, but it is desirable 

 to call attention to these possible changes which are only part of those that 

 must come when fungus nomenclature is reduced to a rational system and 

 is harmonized with that of the higher plants. 



* Dietel in Die nati'irlichen Pjianzcufainilien does not accept this genus 

 while he adopts Phragmopyxis which is distinguished by precisely the 

 same characters. 



f This fungus has been variously known as Caeoma nitens and Puccinia 

 interstitialis. 



