Pl. cell.aph. 11. HYMENOTHECE. 278. Sistot. 649 
Boletus biennis, Bull. Champ. 333; Sowerby Fungi, 191? 
Sistotrema bienne, Persoon Syn. 550. 
On rotten wood and the ground. 
2. Sistotrema confluens. Confluent sistotreme. 
Thallt gregarious, usually in pairs, white, pale; cap 
fleshy, bent, running together; teeth decurrent, whitish. 
Hydnoum sublamellosum, Sowerby Fungi, 112. 
Sistotrema confluens, Persoon Syn. 551. 
In beech woods and fir plantations, on the ground. 
XXXVII. 279. CERRENA. Micheli. ) Cerrena. 
Stem distinct ; cap semicircular. 
Cerrena cinerea. Grey cerrena. 
Thallus tiledlike, corklike; cap semicircular, rough, un- 
derneath grey. 2 
Boletus unicolor, Sowerby Fungi, 325. 
Sistotrema cinereum, Persoon Syn. 551. 
On trunks of trees. 
XXXVIIIL 280. XYLODON. Persoon. Wood-tooth. 
Thallus attached by its back; éeeth irregular, cut. 
ge’ Xylodon quercinum. Oak wood-tooth. 
Thallus bald, pale reddish-grey; teeth thick, irregular, 
cut, slightly tiledlike. 
Hydnovum candidum, Bull. Herb. 481. 
Odontia quercina, Persoon Obs. Myc. 2, 17. 
Sistotrema quercinum, Persoon Syn, 552. 
On dry oak-sticks. 
2. Xylodon digitatum. Fingered wood-tooth. 
Thallus white, diverging; teeth fingerlike, crowded. 
Hydnum paradoxum, Schrad. Germ. 179, 
Sistotrema digitatum, Persoon Syn. 553. 
On trees. 
