The Scottish Naturalist. 233 



161. P. Johnstonii B. & Br. 3236. 



On dead stem of Senecio Jacobcea. 

 Tweed (Berwick). 



XXV. Dilophospora Desm. 



Stroma dark, crustaceous, enveloping the globular ostiolate pycni- 



dia ; conidia rodlike, one-celled, hyaline, with a tuft 



of hairs at each end. 



* 162. D. graminis Desm., 3261, C. 175, M. 1117, (D. Keith.) 



On leaves and glumes of Holcus, Poa pratensis, and other 



grasses in summer. 



Dee (Aberdeen, &c), Moray. 



Fam. 2. Nectrioide^e Sacc. 



For characters see p. 112. 



None have yet been recorded as Scotch. 



Fam. 3, Leptostromace^e Sacc. 



Pycnidia membranaceous or carbonaceous, more or less evidently 

 dimidiate, peltate, dark, without an opening, or ostiolate 

 or hysterioid {i.e. opening by a slit), erumpent or super- 

 ficial. 



Analytical key to Genera. 



1. Hyalospor^:, Sacc. 



Sporidia globose or ellipsoid, or oblong, unicellular, hyaline. 

 A. Pycnidia not hysterioid, {i.e. not opening by a slit). 



B. Pycnidia easily falling from the surface of the host plant, de- 

 presso-clypeate, basidia wanting. Leptothyrium. 



B.B. Pycnidia not falling off, irregular, depressed. 

 Pycnidia often stellately arranged, basidia columnar. 



Piggotia. 

 Pycnidia immersed in a stroma on leaves, basidia obsolete. 



Melasmia. 

 A. A. Pycnidia evidently subhysterioid, opening by a slit ; lanceo- 

 late or elongate, subcarbonaceous, often falling readily 

 from the host plant. Leptostroma. 



. PhragmospoRjE. Sacc. 

 Sporidia oblong, 2-pluriseptate, hyaline. 

 Sporidia fusoid, with a cilium at each end. Discosia. 



