262 



M. C. COOKE ON BLACK MOULDS. 



am now strong in 



the belief that it 



mens ; but having done so, I 

 belongs to the Mucedines. 



Having now traversed the whole of the ground over which I 

 purpose to pass upon the present occasion, it becomes advisable to 

 gather together the fragments into as compact a form as possible ; 

 and this can best be done by arranging the groups in a tabular form, 

 so that the student may see at a glance the relations which they 

 bear to each other, and be enabled to place an unknown mould in its 

 proper place. Advisedly all those having a compound stem have 

 been excluded, in order to bring within reasonable limits a rather 

 large Order. 



Threads simple. 

 Spores not collected into a distinct head — 



A., globose or obovate . 



B. elongated, straight. 



(a.) Threads rigid or dark coloured. 



Monotospora. 



1. Erect, not capitate. 

 Spores single 



„ concatenate 

 ,, triradiate . 



2. Erect, apex swollen. 



„ „ cup shaped 



3. Creeping 



(/3.) Threads flaccid, usually pale. 



1. Spores concatenate. 



„ simple 



„ uniseptate . 



„ variable 



2. Spores single. 



„ bacillary . 



C. multicellular. 



4. Threads rigid or dark coloured. 



Spores basal 

 2. Threads flaccid. 



Spores terminal 

 „ scattered . 



D. helicoid. 



Threads rigid or dark coloured. 

 Spores terminal 

 lateral 



Helminthosporium. 



Dendryphium. 



Triposporium. 



Cladotriclmm. 

 Clasterisporium. 



Fusicladium. 



Cladosporium. 



Heterosporium. 



)7 



Cercospora. 



Septosporium. 



Mystrosporium. 

 Macrosporium. 



Helicosporium. 

 Helicoma. 



