122 CRYPTOGAMIA FUNGI. 



PERS. Syn. 24. HOOK. Scot. ii. 5. Stromatospharia disciformis, 

 GREV. Fl. Edin. 357. Crypt. Fl t. 314. 



Hal. Dead branches of beech, abundant. 



About 2 lines in breadth, gregarious, but each little fungus 

 distinct and always separate, sitting in a cup formed by the 

 bark of the tree, which is torn into 4 or 5 almost equal 

 segments, aptly mimicking a calyx. The prettiest of our 

 species. 



18. S. ambiens, black, in small roundish clusters, perforating 

 the bark in irregular wavy subparallel lines ; orifices of the cells 

 arranged round a smooth central space. PERS. Syn. 44. 



Hob. On dead branches of the hawthorn, covering them to 

 a great extent, rare. 



19. convergent, black, mammillary, concealed by the bark 

 which the necks of the cells perforate, forming a tubercled point ; 

 cells ovate, converging Sow. Fung. t. 374. f. 6. PERS. Syn. 46. 



Hob. Dead branches of various trees. 



The mammillary tubercles are immersed in the true bark 

 which closely covers them, and are rather widely placed. 

 Each encloses several small cells, which converge together, 

 forming a short obtuse neck that perforates the epidermis, 

 where the orifices appear rough or minutely tubercled, ar- 

 ranged round the whitish corky centre. 



20. S. leucostoma, cells collected into small circular mammillarr 

 pustules, distinct, closely covered by the smooth epidermis ; disk 

 white, truncate, perforated by 1-3 black orifices of the cells. 

 Bot. Gall. ii. 687. MOUG. and NEST., No. 659. 



Hob. On dead branches of hawthorn, abundant. 



The pustules are about \ line in diameter, numerous, readily 

 distinguished by their white central dots. 



21. S. stellulata, black, in round wart-like spots bursting through 

 the back; surface tuberculate, the little tubercles or orifices 

 rounded, grooved in a stellate manner ; cells oval, with a rather 

 long neck. Bot. Gall. ii. 686. 



Hab. On dead branches of the elm, in spots ^ th in diame- 

 ter, immersed in the true bark, and surrounded by the 

 ruptured epidermis. 



