350 THE RUSTS OP' NOVA SCOTIA. FllASEH. 



It was less common during the fall of 1910, only one collec- 

 tion, being made. The telial stage was not found although 

 collections were made at various intervals during the fall and 

 early winter. The aecial stage, Peridermium Laricis (Kleb.) 

 Arth. & Kern, has not been collected in North America. 



MEL AMPS' >:{ELL\ Schroet. 



Aecia with peridium. Aeciospores with verrucose walls. 

 Uredinia Avith peridium. Telia effused, indehiscent. Telio- 

 spores within the 6^idermal cells, one-celled ; wall smooth, 

 colourless. 



But one species of this genus is found in l^orth America. 

 Some of the species which Dietel places in this genus are 

 assigned to Hyalopsora by Arthur. 



Melampsorella Cerastii (Pers.) Schroet. 



Melampsorella ehdina (All). & Schw.) Arth. 



0. Pycnia epiphyllous, few, scattered, punctiform, incon- 

 spicuous. 



T. Aecia from a perennial mycelium forming witches' 

 brooms; hypophyllous, in two rows, dropping out of leaf at 

 maturity, mostly irregularly oblong or roundish, rather large ; 

 peridium colourless, soon falling away and exposing spores. 

 Aeciospores sub-globoid or ellipsoid, 15-22 by 19-27/^; wall 

 colourless, thin, closely verrucose. 



IT. Uredinia amphigenous, scattered or grouped, small, 

 round, .1-.4 mm. across, orange-red when fresh, pale yellow 

 when dry; peridium liomispherical, dehiscent by a small 

 central orifice. T'rediniospores ellipsoid or obovoid, 12-18 by 

 16-30/x; walls pale yellow, rather thin, sparsely echinulatc. 



TTI. Telia hypophyllous, on whitish or pale reddish spots. 

 Teliospores within the epidermal cells, one-celled, short- 

 cylinrlricnl or polvgonal, 1.3-20iu. broad ; wall colourless, smooth, 

 thin. 



