THE IIUSTS OK NOVA SCOTIA. — FHASER. 



347 



Melampsora Medusae i Imom. 



0. Pyenia amphigeiioiis. mostly Liy])ophylloii5;. 



1. Aecia hypophyllous, often on the young twigs causing 

 deformation, elongate or rounded, rujUured epidermis incon- 

 spicuous, pale yellow fading to white. Aeciospores gioltoid, 

 about 10-20/a; wall colourless, thick, minurely verrucose. 



II. Uredinia am])higenous or mostly hypophyllous, often 

 on yellowish spots, scattered, roundish, very small, soon naketl, 

 somewhat |)ulvernlent. orange-yellow, fading to pale yellow. 

 Urediniospores ellipsoid or obovate-ellipsoid, 16-17 by 22-2 7/^, 

 wall colourless, rathe;* thick, sparsely but rather strongly 

 verrucose; paraphyses numerous, capitate, thick walled, inter- 

 mix( (1 with the sjjores. ( Ure<linios]iores often flattened later- 

 ally Avith flattened sides smooth). 



III. Telia amphigenous, usually only hypophyllous, 

 scattered or confluent, irregularly roundish, small, slightly 

 elevated, reddish-brown, becoming dark chocolate-brown, 

 siibe])idermal. Teliospores prismatic. 10-16 by 27-46/*; wall 

 smooth, light brown, uniformly thin. 



Pyenia and aecia on leaves and cones of Tsiirjn canadensis 

 ( L. ) Carr.. Pictou. Truro. 



Uredinia and telia on Populus r/ra)ididentata Michx., Pic- 

 tou, New Glasgow, Truro; P. tremidoides Michx., Pictou. 



The Avriter has shown l)y cultures that this species has in 

 this region its aecia on Tsiif/a-candcnsis. (See Mycologia 4: 188. 



1012). The aecial stage 

 is Caeoma Ahietis-canadensis 

 Far!., which is rather com- 

 mon on its host. Arthur 

 has shown by cultures that 

 the aecial stage also occurs 

 on Larl.r (Jour. "My col. 10: 

 ^'^. liiol: 1 ] : r)2. T.xi.-. ; 12:i;>. 1006). Ir i- ])robable that 

 ihcre aiT' two i-aces nf the sauie species, that in the east having 

 nccia I'U TxiKja and in ihe west on Larix. 



■I. ."Surface view of pari of tclium of 

 Meifivip!^orii Medusae. Side view. 



