236 The Scottish Naturalist 



XXIX. Leptostroma Fr. 



Pycnidia superficial, or at first beneath a very delicate cuticle, 

 dimidiate, flattened, elongated, black, often shining, 

 marked with a more or less evident longitudinal furrow 

 or keel ; sporidia ovoid, oblong, or sausage-shaped, uni- 

 cellular, nearly or quite hyaline. Many of the forms are 

 the spermogonia of Hysteriacece among Pyrmomycetes. 



*i7i L. virgultorum Sacc. 3399, C. 570, not previously re- 

 corded as Scotch. 



On dead twigs of Rubus fruticosus (Bramble). 

 Dee (Aberdeen, &c). 



Pycnidia oblong, clypeate, flattened, shining black, with a 

 longitudinal furrow ; sporidia cylindrical, ends rounded, 

 4-5 by 1, hyaline, on clustered slender basidia 20-25 by 

 1. This is the spermogonium of Hypoderma virgultorum, 

 (M. 1800 sub Hysterium virgultorum). 



*i72. L. herbarum (Fr.) Link. 3436, C. 575, Sc. Nat., 1887, 

 p. 40. 

 On dead stems of Teucrium Scorodonia, and of various 

 other herbs. 



Tweed (Berwick), Forth, (Kinross), Dee (near Aberdeen). 

 Winter. 



Pycnidia gregarious, occasionally confluent, at first covered with 

 a thin epiderm, lanceolate, with a median furrow, dark 

 shining brown ; sporidia subfusoid, curved, 4-7 by if 

 hyaline. 

 Europe, Sibeiia. 



*i73 L. Spirese Fr., 3440, C. 576, M. 1089. 



On dead stems of Spircea Ulmaria (Meadow-sweet) in 

 Winter and Spring. 

 Tweed, Tay, Argyle, Dee. 



1730. L. Glechomatis B. & Br., M. 1090, Sacc. Syll. Fung. III. 

 3443, (sub. L. Glechomoe B. & Br.). An examination 

 of the type-specimens (from Glamis), now in Kew 

 Herbarium, showed me that this is not a fungus, but the 

 work of a larva of a small fly, (probably a species of 

 Pkytomyza), which burrows between the epiderms, and 

 thus produces the characteristic spots on the leaves. 



