HYDNEI, 311 



Genus 37. RADULUM, Fr. (p. 263). 



* Denuded ; very variable. 



1. R. orbiculare, Fr. (p. 263) ; 2-3 in. 



2. R. quercinum, Fr. (p. 26:]) ■ o_3 in. Epping Forest. 



3. R. tomentosum, Fr. ; white, inclining to pale ; effused, 

 innate, rather thick, circumference swollen, erect, tomen- 

 tose ; tubercles short, crowded, angular, obtuse, smooth, 

 confluent. 



On Pijrus aucuparia. Menmuir, Forfarshire. New Pit- 

 sligo, Aberdeenshire. 



4. R. deglubens, B. and Br. ; ^ in. ; orbicular, ferru- 

 ginous, somewhat diaphanous ; tubercles erect, somewhat 

 cylindrical, irregular, scattered ; interstices even, pulverulent 

 with the white spores. 



On ash. Sanquhar, :Morayshire. New Pitsligo, Aber- 

 deenshire. 



5. "R. covQllinu^, B. and Br. ; 3 in.; white; effused, 

 subiculum shining, very thin, pelliculose ; tubercles fasci- 

 culate, :^in. across, divided downwards, obtuse, coralloid. 



On oak branches partially covered with lichens. Glamis, 



6. R. epileucum, B. and Br. ; effused for several inches ; 

 ochrey-white ; resupinate ; subiculum white, covered by a 

 waxy stratum ; tubercles scattered, cylindrical, under a lens 

 li mbriated at apex ; deciduous. 



On decorticated wood. Glamis. 



** Innate, removing the hark. 



7. R. fagineum, Fr. ; white, becoming pale ; innate, 

 smooth, tubercles elongated, round, various, obtuse, entire. 



On dead beech. Epping Forest. 



8. R. aterrinum, Fr. ; black ; innate ; strigose ; tubercles 



