10 c Canadian Arctic Expedition, 1913-18 



On Potentilla pulchella R. Br. CoUinson point, June 18, 1914, 98820. 



On Oxytropis Roaldi Ostf. Bernard harbour, Aug. 1, 1915, 98406. 



On Arnica alpina (L.) Olin. South coast of Coronation gulf, July, 1915, 

 J. R. Cox and J. J. O'Neill, 97647. 



In Meddelelser om Groenland, 43, 155, L. Lind states that what he calls 

 Pleospora arctica Fckl. (not Pleospara arctica Karst.) is very probably the same 

 fungus that E. Rostrup in Fungi Groenlandiae repeatedly calls Pleospora her- 

 barum (Pers.). Rostrup held that there is no difference between the two species. 

 Lind, however, contends that there are differences, and he mentions that the 

 sporidia of P. arctica are the smaller and when mature are the darker of the two. 

 Lind would probably call the examples hsted above by the latter name. His 

 diagnosis of P. arctica is as follows: "Peritheciis 350 x 240 fi; ascis oblongis, 

 curvatis, 100-128 x 23-28 /i; paraphysibus numerosis, hyalinis, multiguttulatis; 

 gporidiis initio flavis, dein saturate brunneis, 34-36 x 14-16 n, 6-septatis, 

 medio constrictis, parte superna parum tumidiore longitudinaliter 1-2-septatis." 



Pleospora vulgaris Niessl 



On Lychnis apetala L. Icy reef, Alaska, Aug. 3, 1914, 98292. 



On Ranunculus affinis R. Br. Bernard harbour, July 12, 1915, 97920. 



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

 fructification on this host is rather small for P. vulgaris and much smaller than 

 that of Pleospora papaver aceae (de Not.). 



On Phacafrigida L. Victoria island, March 19, 1916. 



On Erigeron compositus Pursh. Bernard harbour, July 10, 1915, 98960. 



On Artemisia Richardsoniana Bess. Bernard harbour, Aug. 4, 1915, 89998. 



On Saussurea angustifolia DC. Herschel island, August, 1914, 98973. 



Pleospora sp. 



On stems of Papaver nudicaule L. Victoria strait, August 22, 1918, Capt. 

 J. F. Bernard. 



The perithecia bear radiating brown hyphae at base aii\d have constricted 

 sporijdia, upper "half" larger. The species bears a close resemblance to Schroe- 

 ter's F- Drabae. 



Clathrospora Elynae Rabh. 

 Pleospora Elynae Ces. and de Not. 



On Juncus arcticus Willd- Bernard harbour, August 25, 1915, 97820. 



Clathrospora has clathrate, amber-coloured sporidia differing from Pleospora 

 in that the cells all lie in one plane. The asci and sporidia in this collection on 

 Juncus are smaller than the measurements given by Lind as found by him on 

 Luzula collected in Greenland. The sporidia on the Bernard harbour material 

 are very variable in size, reaching a maximum of about 45 x 20 fi. They show 

 about 25 cells on the side and 7 or 8 on the edge. 



Clathrospora pentamera (Karst.) Berlese 

 Pleospora pentamera Karst. Fungi Spetsb. p. 99. 



On Alopecurus alpinus Sm. Bernard harbour, August 25, 1915, 91337. 



The species was first described by Karsten on material found in Spitzbergen. 

 It is reported in Greenland on a half-dozen or more species of grasses and also 

 in western Alaska on Dupontia; hence it is probably a widely distributed inhabit- 

 ant of the arctic grasses. 



The sporidia, when viewed on the flat side, are somewhat pear-shaped. 



Clathrospora platyspora Sacc. 



On Statice Armeria L. forma sibirica (Turcz.) Simm. Cape Bathurst, 

 August 18. 1900, Rev. I. 0. Stringer, 62225. 



