OF BRITISH FUNGI. 155 



Order XXVIL-PHAC1DIACEI. 



Hard ; hymenium ultimately exposed. 



Genera. 



292. Perithecia bursting in the centre by valvular 



teeth. Phacidium, Fr. 



293. Perithecia fjloboso-depressed, at length open 



above. Heterosph^ria, Grev. 



294. Perithecia confluent, opening by flexuose fissures. 



Khttisma, Fr. 



295. Perithecia labiate, splitting from the centre. 



Tuiblidium, lieb. 



296. Perithecia labiate. Mouth linear, narrow. Asci 



elongated. Htsteeium, Tode. 



297. Perithecia branched. Mouth linear, narrow. 



Asci subglobose. .Ailoguapuum, Lib. 



298. Perithecia hemispherical, seated on a byssoid 



mycelium, splitting irregularly. Asci short. 



Astebina, Lev. 



299. Perithecia stipitate, wedge-shaped. Mouth 



linear, narrow. Asci elongated. 



Lophium, Fr. 



300. Perithecia orbicular, splitting horizontally, with 



a deciduous operculum. Ntf.gia, Fr. 



301. Disc innate, erumpent, Beated on a black hy- 



pothecium, persistent. TROCniLA, Fr. 



