170 FUNGUS-FLORA. 



On pino trunks, which are sometimes nearly covered ; 

 sometimes wholly eftused, becomiug pale with age. 



It is open to doubt as to whether the present species is not 

 a form of Polystidus ahietinus. 



EADULUM. Fr. (fig. 9, p. 149.) 



Sporophore resupinate, vaguely eifused ; hymenium tuber- 

 culose ; tubercles distinct at the base, coarse, commonly 

 elongated, deformed, obtuse, mostly waxy; basidia tetra- 

 sporous, present on smooth surface of hymenium as well as on 

 the tubercles. 



Badnhm, Fries, Elenchus, p. 149 ; Stev., Fung., p. 251. 



Growing on wood, and frequently bursting through the 

 bark. Distinguished amongst allies by the large, deformed, 

 elongated, obtuse tubercles. 



The spores arc of value in determining the species in 

 some instances, when external characters leave the matter 

 uncertain. 



* Superficial and exposed from the first ; very variable. 



Radulum pendulum. Fr. 



Longitudinally cil'iised for 1-3 in. or more, whitish, upper 

 margin shortly reiiexed, substance thick, softly coriaceous ; 

 hymenium inferior, tubercles elongated about 2 mm. long, 

 irregular, pendulous ; spores globose, 3 /x diam. 



liadidum jjendidufif, Ti:, 'Eiench., p. 149; Sacc. Syll. vi. n. 

 G928. 



On alder and birch, bursting tlirough cracks in the bark ; 

 also on pino wood. 



Radulum orbiculare. Vr. (fig. 9, p. 149.) 

 Suborbicular, several ol'teii becoming confluent, white, then 

 tinged dull yellow, glabruus, margin byssoid ; tubercles 

 Kubterete, variously scattered or fasciculated, 2-3 mm. long ; 

 during the second season the colour is often dingy flesh- 

 colour; sjiores cylindric-oblong, slightly curved, 10 x 5 /><•• 



lladulmii orbiculare, Fr. Flench., p. 149 ; Stev., Fung., 

 p. 251. 



