317 
1.—Vermicularia trichella. Grev. t 345. On dead ivy leaves, 
common. 
2.—Vermicularia dematium Fr. On dead herbaceous stems, 
Batheaston. 
3.—Vermicularia atramentaria B and Br. On dead potato stems, 
Batheaston. Three out of four British species. 
GENUS 113. biscostaA. Zib.* 
Perithecium fiat, opening at the base. Spores septate, obliquely 
aristate at either end. 
1.—Discosia alnea Zid. On dead leaves, Batheaston. Spheeria 
artoereas Tode II., fig. 72. The only British species. 
GENUS 114. PILIDIUM.t Kze. 
Perithecium scutelliform, smooth, shining, opening irregularly. 
Spores curved, without appendages. 
Pilidium carbonaceum Zi). On willow twigs, St. Catherine’s. 
(Cenangium fuliginosum) Fr. One out of two British species. 
GENUS 115. MELASMIA. Zév.t 
Perithecium membranaceous, dehiscent above, swollen, at length 
depressed and rugose, growing in a thin, spotlike, effused recep- 
tacle. Spores minute. 
Melasmia acerina Ziv. On leaves common. ‘Tulasne considers 
this plant to be the Spermogonia of Rhytisma acerinum. Z2v. 
Ann. Sci. Nat., 1846, p. 276. Tul. Carp. IIL. p. 117. t XV., fig. 
12. There are two British species. 
GENUS 116. piccoTTiA. Band Brs 
Perithseia irregular, very thin, obsolete below, forming by 
confluence a wrinkled mass, bursting by a lacerated fissure. 
Spores rather large, obovate, at length tomiparous. 
* Discosia, from discus, a disk or quoit, from the form of the perithecia. 
} Pilidium, from pilidion, a small hat. 
{ Melasmia, from melasma, a black spot. 
§ Piggottia, named after Mr. Piggott, an English botanist. 
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