Fungi 7 c 



In foliis Cassiopis tetragonae (L.) Don. 



Perithecia deeply immersed in the leaves, only the ostiola erumpent, 270 n 

 in diameter. Asci 75 x 9-10 /x, aparaphysate. Sporidia not constricted, 'Uniseriate, 

 hyaline, elliptic, uniformly 15 x 8 ^i. 



On leaves of Cassiope tetragona (L.) Don. Camden bay, July 2, 1914, 98763. 



Mycosphaerella inconspicua (Schroet.) 

 Sphaerella inconspicua Schroet. Nord. Pilze, p. 12. 



On leaves and flower stems of Cassiope tetragona (L.) Don. Bernard harbour, 

 August, 1915, 98762. 



The species is common on this host. 



Mycosphaerella minor (Karst.) 

 Sphaerella minor Karst. Myc. Fenn. 11, 171. 



On leaves of Dodecatheon frigidum Cham, and Schlecht. Shingle point, 

 Mackenzie river delta, August 4, 1914, J. R. Cox and J. J. O'Neill, 98824. 



Gregarious, connected at base by radiating hyphae. Asci 30-33 n; sporidia 

 9-12 X 3 /i. 



A form of this species on Saxijraga, having larger fruit — asci about 50 x 15 m 

 and sporidia 15-18 x 5 fx — and a brown subiculum visibly colouring the affected 

 areas of the leaf and connecting the species with Sphaerella trichophila Karst., 

 was described in Mycologia IX, 346. The distinction between the two species 

 seems to hinge on the bristly appendages and the size of the fruit. On the 

 collections in hand considerable difference in these features are found on the 

 same host plant, making it difficult to determine to which species the fungus 

 should be referred. 



On Saxijraga Nelsoniana D. Don. Camden bay, June 7, 1914. 



Mycosphaerella minor (Karst.) var. reticulata n. var. 



Peritheciis 75-140 fi ad subiculum. Ascis 50-65 x 10-15 fi. Spoiadiis 15-16 

 X 4-5 /I. 



In foliis mortuis Salicis reticulatae L. 



The radiating, brown, septate, branching fibers bearing the gregarious 

 perithecia are innate and raise the cuticle on the lower side of the leaf into areas 

 of ashen colour 2-4 mm. in diameter. These areas are quite opaque when held 

 against the light. Some of the perithecia are bristly, suggesting the characters 

 of Venturia. These were described in 1917 and published in Mycologia IX: 347 

 under the name of Venturia subcutanea. Subsequent examination of additional 

 material showed forms approaching Karsten's Sphaerella minor in habit and 

 structure but with larger perithecia, asci and sporidia. The smoother and smaller 

 perithecia are much like those of Mycosphaerella minor but the fructification is 

 generally larger and the subiculum denser. The largest and most bristly peri- 

 thecia might be taken for Mycosphaerella trichophila (Karst.) which is also 

 innate and subiculate. It is intermediate between them but all things considered 

 it seems nearer to M. minor and in the meantime is disposed of as a variety of 

 that species. Farther study of sufficient material may yet show it to be a 

 distinct species. 



On leaves of Salix reticulata L. Camden bay, June 29, 1914. 



Mycosphaerella prope oothecam (Sacc.) 

 Sphaerella ootheca Sacc. 



On leaves and peduncles of Ranunculus affinis R. Br. Bernard harbour, 

 July 12, 1915, 97920. 



The asci and sporidia are so variable on this material that the determination 

 of the species is uncertain. A Rhabdospora near Drabae (Fuckl.) and Pleospora 

 vulgaris Niessl were also present on this collection of Ranunculus affinis. 



