PROCEEDINGS OF THE CANADIAN INSTITUTE. 



93 



buried in the bark, their minute punctiform ostiola piercing but scarcely raising 

 the epidermis. Sporules ovate, 3-septate, sub-muriform, brown, 12 — 13 x 6 — 8 fi. 

 On dead branches of Ulmus sp., London, Can. Herb. D., No. 2286. 



AscHERSoNiA Carpinicola, E. & D. 



Stromata convex, erumpent, about 2 mm. in diam., seated on the inner bark, 

 loosely embraced by the lobes of the ruptured epidermis, of carnose texture, nearly 

 amber color when fresh, darker and sub-rufous when dry, easily deciduous. 

 Perithecia minute, buried in the stroma with their dark-colored papilliform ostiola 

 erumpent. Sporules elliptical, hyaline, 15 — 20 x 6^8 // on short basidia. 



On bark of dead Carpinus Americana. London and Dorchester, Ont. Herb. D., 

 No. 2173. 



Septoria Hydrophylli, E. & D. 



Spots brown, at first 2 — 4 mm., circular, at last angular; smoky beneath. Peri- 

 thecia epiphyllous, numerous, 50 — 80 11. Sporules straight or curved, hyahne, 35 — 

 45 X ih fj. 



On leaves of Hydrophyllum Virginicum L., London, Can., May, 1893. Herb. D., 

 No. 2130. 



Septoria Heliopsidis, E. & D. 



Spots irregular, beginning reddish brown, becoming darker, numerous, 2 to 5 mm. 

 in diam. The part of the spot in which the perithecia develop becomes pallid so that 

 the brownish spots become mottled with white areas. Perithecia amphiphyllous, on 

 small whitish areas, sunken, dark-brown, 85 — 100 //. Sporules, straight or flexu- 

 ous, 23 — 54 //, mostly 40 x 1 u. 



On leaves of Heliopsis Icsvis Pers., Thamesville, Ont., Aug. 1892. Herb. D., 

 No. 1981. 



PiGGOTIA NeGUNDINIS, E. & D. 



On leaves of Negundo aceroides. Perithecia minute, subglobose or subelliptical, 

 50 — 70 fi diameter, connate in minute, flattened, punctiform tubercles thickly 

 scattered over the lower surface of the leaf, and at first covered by the epidermis, but 

 soon exposed. Sporules oblong, hyaline, continuous, 2i — 3 x i /i. 



Differs from P. Fraxini B. & C. in its smaller sporules. 



On living leaves of Negundo aceroides, London, Can., Sept., 1896. Herb. D., 



No. 2402. 



MELANCONIE^. 



Gloeosporium Carpinicolum, E. & D. 



Spots sub-orbicular, definite, dark brown, 2 — 5 mm. in diam. Acervuli innate, 

 numerous, minute. Conidia minute, 3 — 4 x i^ — 2 /j, issuing on both sides of the 

 leaf in snow-white tendrils. 



On leaves of Carpinus Americana. London, Can., June, 1893. Herb. D. 

 No. 2122. 



Distinct from G. Carpini (Lib.) and from G. Rohergii Desm., which have conidia 



over 10 // long, 



Gloeosporium confluens, E. & D. 



Spots small, \ — 3 mm., sub-orbicular, greenish at first, becoming horn-color and 

 finally dull white and transparent in drying, often confluent over a large part of the 

 leaf which then may become rusty brown. Acervuli minute, inconspicuous, soon 

 confluent so as to be indistinguishable and filling the whole interior of the spot with 

 the oblong elliptical, continuous, hyaline, 8 — 10 x 3 — 3^ //, conidia. 



On leaves of Sagittaria variabilis. The acervuli also appear on the petioles, and 

 then the conidia are expelled in small white heaps. London, Can., July 1895, Herb. 

 D., No. 2285. 



