366 I'HE RUSTS OF NOVA SCOTIA. — FR4SER. 



germinating teliospores. (Mycologia 3:69. 1911). Field 



collections were also made near the rusted Ledum that seemed 

 without doubt to be connected. These were sent to Dr. Arthur 

 and were determined hy him as Peridermium ahietinum. All 

 stages are very common in the neighbourhood of Pictou. 



Melampsoropsis ledicola (Peck) Arth. 



Chrysomyxa ledicola Lagerh. 



0. Pycnia amphigenous, numerous, arranged in rows, 

 prominent, punotiform, honey-yellow, becoming dark reddish- 

 brown. 



1. Aecia hypophylloas, in two rows on yellowish areas, 

 occupying a part or all of the leaf, much compressed laterally, 

 erumpent from elongated openings, low, dehiscent at apex, 

 soon falling away; peridium colourless, margin lacerate. 

 Aeciospores broadly ellipsoid or globoid, 20-35 by 20-50/t; 

 wall colourless, thick, densely and rather coarsely verrncose; 

 contents orange-red fading to colourless. 



II. Uredinia epiphyllous, on reddish-brown spots, round- 

 ish or oblong-polygonal, early dehiscing, ruptured epidermis 

 evident; peridium delicate. Urediniospores chiefly elliptical 

 or globoid, 20-32 by 30-45^; wall thick, colourless, verrucose 

 with close set, dociduop.s tubercules: contents orange-red. 



III. Telia epiphyllous, chiefly grouped on discoloured 

 areas, irregular or roundish, small about .2-. 5 mm. in diameter, 

 ruptured epidermis evident. Teliospores oblong or cuboid, 

 16-22 by 18-33/x; wall colourless, thin, smooth, in a series 

 65-100/i long; contents orange-red when fresh. 



Pycnia and aecia on Picea canadensis (Mill.) BSP., P. 

 rubra (DuEoi) Dietr.. P. mariana (Mill.) BSP., Pictou, 

 Truro. 



Uredinia and telia on Ledum f/roenlandicum Oeder. Pictou, 

 Truro. 



