136 CRYPTOGAMIA FUNGI. 



Hob. On the dead portions of the wood of various trees. 

 Our specimens are on the stems of the dog-rose. 



3. H. Fraxini, elliptical, subcortical, convex, tumid, black ; cleft 

 with obtuse smooth lips. PERS. Syn. 100. HOOK. Scot. ii. 8. 

 GREV. Crypt. FL t. 72. Fl. Edin. 367. 



flab. On dead branches of the ash, produced under the 

 epidermis, which becomes of a pale colour, and forms a 

 spot generally of a circular form, and on which the Hys- 

 teria are arranged in a subconcentric manner. 



4. //. pulicare, scattered, oblong, short, tumid, dull black, ob- 

 scurely striate ; cleft broad with obtuse lips. HOOK. Scot. ii. 8. 

 GREV. Fl. Edin. 366. Crypt. Fl. t. 167- 



Hab. On dead portions of various trees. 



Our specimens are on dead branches of Vaccinium Myrtillus, a 

 plant not heretofore enumerated amongst those liable to 

 be infested with this Hysterium. It offers, however, no 

 character which might entitle it to be considered a distinct 

 species. 



* * On leaves. 



5. H. gramineum, minute, linear-elliptical, black, mostly on the 

 ribs of the leaf or culm. GREV. Crypt. Fl. t. 87. Fl. Edin. 367. 



Hab. On the leaves and stems of grasses. 



6. H. pinastri, elliptical, depressed, the margin plane, paler and 

 often bounded by a black line, the centre slightly raised. PERS. 

 Syn. xxviii. GREV. Crypt. Fl. t. 60. Fl. Edin. 367. HOOK. 

 Scot. ii. 8. 



Hab. Leaves of Scotch fir, very common. 



7. H. Juniperi, elliptical, glossy black, somewhat plane, growing 

 longitudinally on the leaf. GREV. Fl. Edin. 367. Crypt. Fl. 

 t. 26. 



Hab. On dead juniper leaves, not rare. 



* * * On cones. 



8. H. conigenum, minute, roundish or oval, black, bursting the 



