9 2 



BASIDIOM YCE TES 



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



(parasitic on Lcgttminosae ) . PHRAGMOPYXIS. 



Endospore of teleutospore without a mucilaginous layer; (parasitic on 



A'osaceae). PHKAG.MIDIUM.* 



Of the above genera Piiccinia contains about three hundred 

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

 pyxis* and Phragmopyxis each contain a single species, the for- 

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

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

 berry or raspberry rust which is everywhere abundant causing 

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

 of the aecidial stage of the fungus j- Triphragmium is a small 

 genus (PL 6. f. /j>), one of the best known species being found on 

 Aralia nudicaiilis but this does not seem to appear below a 

 certain altitude. 



Phragmidium has several species on Rosa, Potcntilla and Rubies, 

 the species on cultivated roses being very abundant in some 

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



Ravenelia has several American species mostly on members of 

 the Leguminosae (PL 6. f. n, 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 Accidiuin whose characters 

 have been already set forth (PL 6. f. /). Others for the same 

 reason must stand in Roestelia. Some aecidial forms without a 

 pseudoperidium belong to the genus Cacoma. A few isolated 

 forms represent the uredo stage and these must remain in like 

 manner in the genus Uredo. Among these is Urcdo ficus 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 Pftanzenfamilien does not accept this genus 

 while he adopts Phragmopyxis which is distinguished by precisely the 

 same characters. 



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

 inter ditialis. 



