In 3 t O 
242 
THIRTEENTH REPORT. 
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Asciis 8-spored: (3) 
Asciis many-spored : Ditopella. 
( D . fusispora on Alder.) 
Spores elliptical; on leaves and steins of herbs; ostiole rather long: 
G nomoniella. 
Spores sausage-shaped; on fruit and branches of the apple tree; the 
imperfect stage==“Gloeosporium fructigenum Glomerella. 
( G. rufomaculans ) . 
(q) Massariaccae. (Saprophytes). 
Spores more than 2-cel led, brown, elliptical to fusiform; on branches 
of trees : Massaria. 
(r) Mycospliaerellaceae. (Saprophytes and Hemisaprophytes) . 
Spores regularly 2-celled : (2) 
Spores 1-cel led, when old divided into 2 very unequal parts: 
Gnignardia. 
(G. Bidwellii, parasit. on Grapes). 
( G. Vacinii. on Huckleberry). 
Parasitic on leaves of living plants: Stigmatea. 
Saprophytic on leaves, branches, wood, fruit, ferns, etc., perithecia 
minute; a large genus of about 500 species: Mycospliaerella. 
(Syn=Sphaerella) . 
(M. idmi on elm leaves). 
(s) Pleosporaceae. (Saprophytes and Hemisaprophytes). 
Spores 1-celled, hyaline or brownish: Physalospora. 
Spores 2-celled : (2) 
Spores more than 2-cells: (4) 
Ostioles or perithecial wall with hairs or bristles; spores hyaline or 
brownish : Venturia. 
(T 7 . Pom,/— Apple scab. 
( V . Pyrini = Pear scab. 
Perithecia not hairy: (3) 
Spores hyaline: Didymella. 
(D. citri , on Orange trees). 
Spores brown: Didymospliaeria. 
Spores with septa in one plane only: (5) 
Spores muriform, i. e. with septa in several planes (7) 
Spores fusiform or elongated : (6) 
Spores long thread-like, often breaking up into its component 3 cells: 
Ophiobolus. 
(O. gram inis on wheat). 
