472 



Bulletin 315 



The spores are hat-like, with projecting borders on the edge of the base, 

 diameter without border 2~2)iJ-', spores 2-4 in a mother cell. On germi- 

 nation the spore buds directly. Cardinal points for sporulation on the 

 gypsum block are as follows: minimum 2.5-7.5° C., optimum 30° C, 

 maximum 32-34° C. Spores are found in the mold membrane (kahm- 

 haut) as well as in the sediment. 



Hab. Found in impure brewery yeasts in English and Belgium beers, 

 on bran, marsh-mallow sap, in soil, on plums and other fruits. 



Chaetomium olivaceum Cooke & ElHs, Grev. 4: 96. 1876. ElHs and 

 Everhart, North American Pyrenomycetes, 124. 1896 



Perithecia gregarious, ovate-globose, about 

 250JU high by 200/x broad, thickly and evenly 

 clothed with soft granular roughened, flexuose, 

 sparingly septate, simple greenish yellow hairs 

 3-4/i thick, without any very distinct apical tuft 

 of coarser hairs, as is usual in most of the 

 species. Asci oblong clavate p.sp. 35-40 by 12 n. 

 Fig III —Chaetomium Sporidia crowded, globose, elliptical, apiculate at 

 olivaceum Cooke & Ellis, each end, yellowish brown, 9-12 by 8-9M (mostly 

 A, perithecium, x 60; B, u o \ •^.'u j.^ 1 



mature and immature 9-1 1 by 7-8^), With one or more guttulas. 



asci, X 236.6; C, asco- Hab. Isolated from oat field in July, 1910, near 



spores, X 533.3 ^^^ College of Agriculture, Cornell University, 



Ithaca, N. Y., by the writer. Plant pathology herbarium No. 5,905. 



Pleurage verruculosis n sp. 



Perithecia scattered or aggregated, sunken 

 but becoming partly to entirely exposed at 

 maturity, membranaceous to carbonaceous, black, 

 opaque, 350-750 by 225-375/i, pyriform to 

 subglobose, with straight or ctirved beak. 



Asci 4-spored, cylindrical, broadly rounded at 

 apex and tapering below into a slender stipe, 

 perforate, 90-150 by ii-i6;u; paraphyses filiform, 

 slightly tapering upward, longer than the asci, 

 septate to articulate. 



Spores vertically uniseriate, long ovate when yio. 

 young to subglobose at maturity, obtusely pointed 

 above and broadly rounded to truncate below, 

 germ pore prominent, strongly tuberculate, ranging 

 in color from hyaline when young through brown 

 to black at maturity, 12-14 by i6-i8jLt, primary 

 appendage 6 to 8/i and conic shortly after migration of protoplasm 

 from below is completed and the septum is formed, at full maturity it 



112. — Pleurage ver- 

 ruculosis. A, perithe- 

 cium, X 60; B, asci, 

 showing immature spores 

 and paraphyses, x 236.6; 

 C, stages in maturation 

 of ascospores, x 236.6 



