192 CRYPTOGAMIA-FUNGI. 



105. STILBOSPORA. 



OBS. The Stillbospora appear to be a mere conglomeration of 

 granules separating readily in water, but which we must suppose 

 are naturally held together by some gelatinous substance inter- 

 mixed. They are of a black colour, produced under the epidermis 

 of trees which they rupture, and the spots they form resemble a 

 little mass of fine gunpowder. 



1. S. biloculata, black, roundish, bursting through the bark ; 

 granules ovate, obtuse, 2-celled GREV. Fl. Edin. 366. 



Hob. On dead branches of the whin, common. 



2. S. conglomerata, spots roundish, very black, pulverulent, 

 bursting through the epidermis ; granules very minute, globular 

 or pear-shaped, undivided Melanconium conglomeration, LINK in 

 WILD. vi. ii. 92. Bot. Gall. ii. 884. 



Hab. On branches of a willow, in spots about a line in 

 diameter. 



3. S. microsperma, spots small, round, convex, covered in gene- 

 ral by the raised epidermis; granules very numerous, oblong, 

 pellucid, undivided GREV. Fl. Edin. 366. MOUG. and NEST. 

 No. 384. 



Hab. On dead branches of beech and willow. 



4. S. betulina, spots oval, convex, spreading widely at the base, 

 yellowish ; granules oval, 2-celled, minute PERSOON. Didy- 

 mosporium betulinum, GREV. Crypt. Fl. t. 273. 



Hab. On branches of dead birch-trees, produced beneath 

 the epidermis, and bursting through in the form of little 

 deep black conical masses, 1 -3 lines in breadth. Sent 

 from the neighbourhood of Wooler, by James Mitchell, 

 Esq. surgeon, R. N. 



106. SEPTARIA. 



1. & Ulmi, spots small, scattered, white or very light rose-co- 

 lour, at length effused and irregular ; grains cylindrical, curved, 

 tapered at one end, divided by 3 or 4 septae GREV. Crypt. Fl. 

 t. 112. 



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