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GENUS 274. RHYTISMA.* 
Perithecia forming a confluent mass, opening by flexuous 
fissures. 
R——— acerinum /r. Very common. The early state of this 
plant is Melasmia acerina Lév, and occurs in Autumn ; in the 
following Spring the ascophorous state is developed. 
GENUS 275. HYSTERIUM.+ Tode. 
Perithecium labiate ; border entire ; orifice narrow-linear ; asci 
elongated. 
H——— Pinastri Schrad. Lucknam, February, 1850, on leaves 
of Pinus pinea. 
— var. B. juniperi. Rudlow, December, 1844. 
H——— foliicolum 77. On Cratcegus Crus-galli, Shockerwick, 
April, 1857. 
H——— Fraxini P. Batheaston, June, 1867. 
H pulicare P. Batheaston, Winter, on bramble, dead 
wood, &c. 
H elongatum Wahi. Batheaston, on bramble, &c. 
H——— caricinum Desm. Spye Park, on Carex paniculata, 
February, 1850. 
rufum DL. and Br. MSS. Immersed in the substance 
of the leaf, crumpent, elliptic or linear, lips black, narrow, 
open when moist, closed when dry ; disc pale reddish-brown, 
about 0,01 to 0,03 inch long ; asci clavate, 0,0025 inch long ; 
paraphyses linear, strongly curved at the summit; sporidia 
H— 
elliptic, obtuse at the ends, containing 4-6 globose sporidiola; _ 
related to H caricinum, but differing in the red colour 
of the disc. On some Carex, Spye Park, May, 1843. 
angustatum 4. and S. Durdham Down, March, 1879. 
C. Bucknall, Lc. iii., 9. 
H— 
* From rutis a wrinkle. 
+ From ustera, pointing to the peculiar form of the Genus. 
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