Ii6 The Scottish Naturalist. 



personal identification of species, were made from my own micro- 

 scopic specimens. The descriptions of genera and of larger 

 groups are from Saccardo's Sylloge Fungorum, Vol. III. 



Note. Pycnidia, employed below instead of perithecia, is preferred here, as 

 the latter term is better restricted to the corresponding organ in the mature 

 Pyrenomycetet. Sporidia is preferred to sporules as a term more familiar in 

 British works. The measurements given below are in thousandths of a milli- 

 metre, unless specified ; m?n. denotes that they are in millimetres, or infractions 

 of a millimetre. 



SPH^ROPSIDE^, Lev. 



Fungi possessed of pycnidia (without asci), inside which are 

 sporidia supported on more or less evident basidia (foot stalks). 



Fam. i. SPH^ERIOIDE^E, Sacc. 



Pycnidia membranaceous, carbonaceous, or subcoriaceous, dark 

 (never fleshy or bright hued), globose, conical, or lenticular, entire, 

 immersed or superficial. 



. i. HYALOSPOR^S, Sacc. 



Sporidia hyaline, globose, ovoid, or sub-oblong, straight or rather 

 curved (sausage-shaped or allantoid), continuous (one-celled, i.e., 

 without septa). {Note. Some forms referred to this section by 

 Saccardo approach Scolecosporca in the long, slender sporidia; others 

 approach Phaosporce in their depth of colour, and others have two- 

 celled sporidia, like those of Ascochyta, sometimes associated in 

 vhe same pycnidium with the ordinary one-celled form.) 



Analytical key to the genera. 



A. Pycnidia separate from one another. 



B. Pycnidia bare, without bristles. 



C. Causing discoloured spots on leaves and stems. 

 Pycnidia lenticular, opening by a pore. 1. Phyllosticta. 



C.C. Not causing discoloured spots. 



D. Sporidia without appendages.* 



E. Subiculum absent. 



F. Pycnidia subcutaneous, membranaceous or subcoriaceous, 



often papillate, basidia each bearing one sporidium, often 



very short. #. Phoma. 



F.F. Pycnidia as in Phoma, basidia branched or toothed, each 



bearing several spores. 3. Dendrophoma. 



E.E. Subiculum present as radiating black fibrils, to which the 



pycnidia are affixed. 4. Asteroma. 



