404 BRITISH DISCOMYCETES. 
(5 to 7-6u) long, whereas in A. bullatus they are ‘0004 
inch (10) (B. and Br., 0. ¢.). 
Name—From the name of the host plant. 
Dr. Masters. 
7. Ascomyces turgidus. (Sadeb.) 
Producing “nests,” or “witches’ besoms,” on birch, 
developing the asci in spring and summer on the under 
side of the leaves, on which the leaves at first curl up 
sinuously, lose the fresh green colouring of the healthy 
leaf, and on the breaking forth of the asci appear to be 
covered on the under side with a greyish-white hoariness. 
The asci are 46—50u long, and about 15u broad: they 
have a stem-cell 16—17y high, and 15y broad; they, 
however, diminish conically downwards and penetrate 
between the epidermal cells, The sporidia are 3—4y in 
diameter. 
Exoascus turgidus—Sadeb. in Rab., “Crypt. Flo.,” 
vol. vi p. 8. 
On Betula alba, both on the large trees and small 
ones, From the end of May to the middle of August. 
The occurrence of “witches’ besoms ” are by no means 
uncommon on birch in this country, and if they are pro- 
duced by this fungus, as Professor Sadebeck asserts, the 
species must be recorded here. 
C. SPECIES THE POSITION OF WHICH IS AT PRESENT 
UNCERTAIN. 
8. Ascomyces Juglandis. Berk. 
Hypophyllous, effused, snow-white on the nerves of 
the leaves; sporidia ovoid, hyaline. 
Ascomyces Juglandis—Berk., “ Outl,” p. 376; Cooke, 
“ Handbk.,” No. 2235. Gymnosporium leucosporwm— 
Mont., “ Syll,” p. 390. 
On walnut-leaves, Juglandis regia. 
Name— From the tree on which it grows. 
