8 c Canadian Arctic Expedition, 1913-18 



Mycosphaerella pachyasca (Rostr.) Vgr. 

 Sphaerella pachyasca Rostrup. Sacc. Syll. IX, p. 613. 



On Oxyria digyna (L.) Hill. Bernard harbour, July 6, 1915, 98150. 



On Papaver nudicaule L. Bernard harbour, Aug. 25, 1915, 97855. 



On Draba nivalis Liljebl. Bernard harbour, July 17, 1915, 98657. 



On Parrya arctica R. Br. Bernard harbour, July 10, 1915, 98704. 



On Potentilla palustris (L.) Scop. Herschel island, Aug. 1, 1916, 98738. 



On Astragalus alpinus L. Collinson point, July 17, 1914, 98214. 



On the type specimen of Artemisia hyperborea Rydb. Bernard harbour, 

 Aug. 14, 1915, 89997. 



On Artemisia sp. Victoria island, March 29, 1916. 



This species seems to be the commonest pyrenomycete on dicotyledons in 

 the region. 



Mycosphaerella Pedicularis (Karst.) 



Sphaerella Pedicularis Karsten. Fungi Spetsb. No. 53. 



On Pedicularis sudetica Willd. South of Coronation gulf, July 18, 1915, 

 J. R. Cox and J. J. O'Neill, 98913. 



Mycosphaerella Tassiana (de Not.) Johans. 

 Sphaerella Tassiana de Not. Sacc. Syll. I, p. 530. 



On Trisetum spicatum (L.) Richter. Wollaston land, Aug., 1915, D. Jenness, 

 91355. 



Judging from the Greenland reports and that of the Fram expedition, this 

 fungus is the one most commonly found on the grasses of our northeast arctic 

 region. 



Physalospora Crepiniana Sacc. and March. 



On Empetrum nigrum L Herschel island, July 29, 1916, 98781. 



Perithecia are hypophyllous. Asci paraphysate, 60-75 fi. Ascospores 18-21 

 x8 fi. 



Didymosphaeria Johansenii n. sp. 



Peritheciis hypophyllis, dispersis, immersis, globosis. circa 100 n in diam.; 

 ostiolis emergentibus, perforatis. Ascis subglobatis clavatisve, breviter stipi- 

 tatis, 33-45 x 18-25 /x. Sporidiis sub-biseriatis congregatisve, uniseptatis, 

 hyalinis denique fulie-ineis, 12-16 x 4.5-6 yu. 



In foliis et petiolis Mertensiae maritimae (L.) S. F. Gray. 



Perithecia hypophyllous, thickly scattered, immersed, globose, about 100 n 

 in diameter; ostiola emergent, perforate. Asci sub-globate to clavate, sometimes 

 widest near the short-stipitate base, 33-45 x 18-25 fi. Sporidia biseriate to 

 congregate, uniseptate, hyaline at first, becoming fuliginous, 12-16 x 4.5-6 m, 

 mostly 15 X 5 Ai. When immature this species would be taken for a Mycosphaer- 

 ella. 



On leaves and petioles of Mertensia maritima (L.) S. F. Gray. Spy island, 

 Alaska, Sept. 3, 1913, 98954. 



On the same host, but immature, west of Martin point, end of July, 1914, 

 98959. 



Metasphaeria sp. [probably Etnpetri (Fr.) Sacc] 



On Empetrum nigrum L. Bathurst inlet, Aug. 22, 1915, R. M. Anderson, 

 98780 



Asci paraphysate, 60 x 8-11 fi; sporidia hyaline, 3-septate, 15 x 3-4.5 /i. 



