MICHIGAN ACADEMY OF SCIENCE. 
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k. Stroma either initiated under the bark and later becoming super- 
ficial, or entirely developed as cushions or even erect bodies on the 
surface of the substratum: (2) 
l. Spores hyaline or pale brownish; stroma pushing up through the 
bark: * (x) Diatrypaceac. 
1. Spores blackish-brown, stroma on the surface, or as erect, club- 
shaped, black, single or branched, Olavaria-like bodies : 
(y) Xylariaceae. 
(m) Sordariaceae. 
1. Spores 1-celled : Sordaria. 
1. Spores 4-many-celled : Sporormia. 
(n) Ceratostomataceae. (Saprophytes.) 
1. Spores hyaline, 1-celled : Geratostomella. 
1. Spores brown ^ 1-celled : Ceratostoma. 
(o) Sphcieriaceae. (Saprophytes & hemisaprophytes) . 
1. Perithecia hairy or spiny: (2) 
1. Perithecia smooth : (4) 
2. Perithecia walls thin, membranous or leathery; spores several-celled, 
hyaline, fusiform : Acantho stigma. 
(A. parasitica, on Silver Fir). 
2. Perithecia walls thick, carbonaceous or woody, friable: (3) 
3. 
3. 
O 
o. 
Spores several-celled, fusiform, hyaline or brown : Herpotricha. 
( E . nigra, on larch, spruce, etc.). 
Spores several-celled, cylindrical-curved, hyaline or brown : 
Lasiosphaeria. 
Spores 1-celled, dark-colored: Rosellinia (in part). 
4. Spores hyaline, 2-many-celled ; perithecia warty on surface: 
j Berlin. 
4. Spores dark-colored, 1-celled : - Rosellinia. 
(R. necatrix , on roots of trees, etc.) 
R. aquila, on Mulberry roots. 
(R. Quercina, on roots of Oak seedlings, etc.) 
(p) Gnomoniaceae. 
(Saprophytes or Hemisaprophytes) (Spores hyaline). 
1. Spores 1-celled: (2) 
1. Spores elongated, 2-4-celled: Gnomonia. 
( G. padicola on cherry tree) . 
(G. leptostyle on Walnut leaves). 
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