'S90 THE RUSTS OF NOVA SCOTIA. — FKASER. 



Triphragmium clavellosum Berk. 



Nyssopsora clavellosa (Ijerk) Arthur. 



0. Pyonia imknown, possibly not formed. 



I & IT. Awia and telia wanting. 



III. Telia epiphyllous, rarely on stems, on oireulai 

 Aellowish spots about 4 mm. in diameter Avhicli may become 

 purplish, crowded, often circinate, sometimes confluent, small, 



mostly circular, about .3-.4 mm. in 

 diameter, sometimes elongate, sur- 

 rounded by the ruptured epidermis, 

 pulverulent, black. Teliospores 



three-celled, somewhat triangular or 

 truncate-obovate, about 27-33]".; wall 

 dark brown, with bent S])incs up to 

 lljii., tips forking and recurved; 

 Teliospores of Triphraomium pedicel hvalinc, exceeding the spore. 



clavellosum. It t t t t-»'i^ 



On Aralia nudicaiihs L., rictou, 

 'New Glasgow. 



The large black groups of telia, which are sometimes very 

 aljundant on the upper surface of the leave? make this a very 

 conspicuous rust. 



GVMN'OSPOIlAN(;ir\T IlcfUv. F. 



Aecia with well developed jteridium dehiscing by longi- 

 tudinal slits. Teliospores two-celled (rarely 3-5-celled), 

 embedded in a gelatinous matrix, germ-pores usually more than 

 one in a cell and lateral. Uredinia unknown. 



The telial stage of the specie:^ of this genns as far as is 

 known infest the Ciipresseae, the majority of the species 

 occurring on Juniperus. The aecial stage occurs on the tribe 

 Pomeae of the family Eosaceae. The only exception to this is 

 Oymmosporangium exiemum Arth. k Kern, in which the aecial 

 i-tage is foimd on GiJJenia stipulareae (Mycologia 1:253. 1900). 



