CO GO -'I 0)05 OIUIOI coco MW 
244 
THIRTEENTH REPORT. 
2. Stroma crust-like, effused or as scattered areas over the blackened 
substratum : Nummularia. 
(N. discreta on Apple trees). 
(N. BulUardi on Beech trees). 
2. Stromata in plates, cushions or globular patches: (3) 
3. Stroma concentrically stratose : Daldinia. 
«/ 
3. Stroma not stratose: (4) 
4. Stroma woody or carbonaceous, reddish, brown or black: Hypoxylon. 
4. Stroma at first fleshy, then carbonaceous: Ustulina. 
(I) (Hysteriales.) (Phaeidiales.) 
1. Fruit-bodies elongated or boat-shaped: (2) 
1. Fruit-bodies angular, roundish or star-shaped: (6) 
2. Hysterotliecia imbedded in the substratum with which they are 
grown together: r (3) 
. Hysterotliecia breaking through the surface of the substratum. (4) 
. Hysterotliecia all upon the surface of the substratum, linear. . (5) 
. Spores fusiform, 4-celled : Gloniella. 
. Spores filiform, 1-celled : Lophiodermium. 
( L . pinastri on conifer-needles) . 
. Spores elliptical, 1-man y-celled, hyaline; on oak and beech 
branches : * Dichaena. 
. Spores with 4-8 cells in a row, at length brown, elliptical : Hysterium. 
. Spores with 2-4 cells in a row, hyaline: Glonium. 
. Spores muriform, many-celled, hyaline to brown : Hysterographium. 
Hysterothecium brown or black: (7) 
. Hysterothecium not blackish ; hymenium exposed by the folding- 
back of the covering layers: (10) 
Hysterothecium at first immersed, later breaking forth from sub- 
stratum: (8) 
Hysterthecium imbedded in the substratum, which is torn and 
folded back: (9) 
Spores muriform; on wood, minute: Tryblidium. 
Spores needle-shaped, 2-8 celled, hyaline, on branches, stems, etc.: 
Scleroderris. 
9. Without a stroma; spores 1-celled, hyaline, oval or fusiform; mostly 
on leaves : Phacidium. 
