102 
Mycologia 
dififiise, dark-red or purple-brown border 1-5 mm. in width. Pyc- 
nidia nearly concolorous with the arid area, epiphyllous, although 
visible from the under side, 1 50-200 Conidia hyaline, obscurely 
i-septate, 2-3-nucleate, rounded at the ends, 14-20X5-6.5/4,. 
On living leaves of Achlys triphylla DC., Vancouver Island, 
June, 1915, John Macoun. 
14. Diplodia constricta sp. nov. 
Pycnidia thickly scattered mostly along one side of the stems, 
small, 0.2-0.4 mm., showing the very short ostiola through a stel- 
late or simply cleft rupture of the epidermis. Conidia dark- 
brown, strongly constricted, 18-22 X 9-10 /i. 
On dead stems of Spiraea Menziesii Hook., British Columbia, 
June, 1915, John Macoun. Of the several Diplodias on species of 
Spiraea this comes nearest D. Spiraeae Thiim. Sacc. Syll. III. 
P- 342. 
15. Diplodia Ulmi sp. nov. 
Pycnidia thickly scattered, 250-400 /i, single or in small groups, 
subglobose, immersed in the unaltered cortex, raising the epi- 
dermis into small pustules which are scarcely visibly ruptured by 
the minute ostiola. Conidia brown, elliptic, constricted, 15-17 X 
9-10 /t. 
On dead branchlets of Ulmus americana L., London, Ontario, 
October, 1903,/. Dearness 3052. The bark externally is so slightly 
altered in appearance that the presence of the fungus is apt to 
escape notice, but in a tangential shaving the black shining pyc- 
nidia strongly contrast with the pale cortex. 
16. Diplodia Nuttalliae sp. nov. 
Pycnidia seated around the lenticels through which the fungus 
seems to have invaded the host, slaty-brown in section but the 
basidial portion white, 0.5-1 mm. Conidia dark-brown when 
fully mature, oblong-elliptic, even or but slightly constricted at 
the septum, 18-24 X 7-9/^, on basidia 4/4. thick, sometimes longer 
than the spore. 
On Nuttallia cerasiformis Torr. & Gr. Victoria, B. C., April, 
1915, John Macoun. 
