18 c Canadian Arctic Expedition, 1913-18 



An immature specimen collected on Herschel island, July 31, 1916, pre- 

 served in alcohol, seems to be this species. 



Lycoperdon umbrinum Pers. 



On Herschel island, end of July, 1916. 



A single specimen 4 cm. high, turbinate head 2-5 cm. wide, and nearly 

 cylindrical stem 1 . 5 cm. thick with the typically large-celled interior. Identi- 

 fication confirmed by Mr. C. G. Lloyd. 



The Alaska list (op. cit.) gives two identified and two unidentified puff- 

 balls. Seven members of the family are reported in the Greenland fists, Lyco- 

 perdon gemmatum being the commonest Greenland species. 



W. S. Bruce in his very interesting little book on Polar Exploration speaks - 

 of the commonness of "deadman's snuff," the spores of the puff-ball species. 

 Puff-balls may be common in the Old World arctic regions but the species do 

 not seem to be numerous in the American arctic country. 



FUNGI IMPERFECTI. 



LEPTOSTROMACEAE. 



Leptothyrium pulchrum n. sp. 



Pycnidiis epiphyllis, orbiculatis vel late ellipticis, nigris, depressis, diverse 

 apertis, interdum fissis, 200-450 /i. Conidiis hyalinis, 3-8 x 1-1.5 /*. Basidiis 



15-28 X 1-1 -5 M. 



In foliis mortuis Salicis pulchrae Cham. 



Pycnidia epiphyllous, circular to wide-elliptic, black, shining, centrally 

 depressed, opening variously, in some cases cleft or gaping, 200-450 fi. Conidia 

 hyaline, 3-8 x 1-1 -5 /* on long sporophores 15-28 x 1-1-5 /x. 



On dead leaves of Salix pulchra Cham. CoUinson point, June 11, 1914. 



The general colour of the dead leaves is chocolate-brown. The pycnidia 

 are scattered on much paler spots that are translucent when held to the light. 



Leptostroma herbarum (Fr.) Sacc. 



On Polemonium caeruleum L. var. villosum (Rud.) Brand. Konganevik, 

 July 5, 1914, 98965. 



Long narrow pycnidia; Spores 4-7 x 1-5-2 /i. 



Leptostromella Drabae n. sp. 



Pycnidiis sub-orbicularibus, discoideis concavisve, vel elHptico-oblongis, 

 hysteroideis, brunneis, 65-160 n. longis. Conidiis sessilibus vel sub-sessilibus, 

 hyalinis, crescentibus, extremis partibus acutis, continuis, 15-18 x 2-2-5 ix. 



In caulibus Drabae corymbosae R. Br. 



Pycnidia suborbicular, discoid or concave to elliptic-oblong, hysteroid, 

 thickly scattered on stem, brownish, sub-superficial, 65-160 fx long. Stylospores 

 on short basidia or sessile, hyaline, crescentic, gradually narrowing, acute at 

 each end, continuous, 15-18 x 2-2-5 m- The yellowing of the affected stems 

 seems to be due to the fungus. 



The type on stems of Draba corymbosa R. Br. Bernard harbour, August 7, 

 1915, 98661. 



On Draba alpina L. Bernard harbour, July 10, 1915, 98618. 



Discosia acuta n. sp. 



Pycnidiis nigris, planis vel centraliter depressis, ostiolatis, 120-170 ix. 

 Conidiis hyalinis, 2-septatis, curvis, angustis, acutis, 18-24 x 1-1-5 ix. Aristis 

 6-9 ju longis. 



