170 FUNGUS-FLOKA. 



On pine trunks, which are sometimes nearly covered; 

 sometimes wholly effused, becoming pale with age. 



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

 a form of Polystictus dbietinus. 



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



Sporophore resupinate, vaguely effused ; 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. 



Badulum, 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 are 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 effused for 1-3 in. or more, whitish, upper 

 margin shortly reflexed, substance thick, softly coriaceous ; 

 hymenium inferior, tubercles elongated about 2 mm. long, 

 irregular, pendulous ; spores globose, 3 fi, diam. 



Badulum pendulum, Fr., Elench., p. 149 ; Sacc, Syll. vi. n. 

 6928. 



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

 also on pine wood. 



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

 Suborbicular, several often becoming confluent, white, then 

 tinged dull yellow, glabrous, margin byssoid; tubercles 

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

 during the second season the colour is often dingy flesh- 

 colour ; spores cylindric-oblong, slightly curved, 10 x 5 p.. 



Badulum orbiculare, Fr. Elench., p. 149 ; Stev., Fung., 

 p. 251. 



