38 



BRITISH MYCETOZOA. 



[Lachnobolus. 



Fig- 39- 

 Lachnobolus circinans Fries. 



a. Cluster of sporangia. Twice 



natural size. 



b. Capillitium and spore. Mag- 



nified 300 times. 



Genus 31. LACHNOBOLUS Fries.— 

 Sporangia sessile clustered. Capillitium a 

 loose network of threads attached to many 

 parts of the single persistent sporangium- 

 wall. 



1. L. circinans Fries. — Sporangia 

 subglobose, shining ochraceous-brown ; 

 sporangium-wall membranous, firm, papil- 

 lose. Capillitium of freely branching 

 ochraceous-yellow threads, closely and 

 equally beset with prominent warts. 

 Spores pale yellow, almost smooth, 6 to 

 8 fi, diam. 



Hab. On dead wood. 



Genus 32. PERICHiENA Fries. — Sporangium-wall ot 

 layers, the outer thickened with dark 

 granules which are exceptionally absent 

 in the upper part. Capillitium of slender 

 branching threads minutely warted or 

 spinose. 



two 



1. P. chrysosperma Lister. — Spo- 

 rangia curved or ring-shaped plasmodio- 

 carps, sometimes subglobose, brown ; 

 sporangium-wall subcartilaginous, with 

 external granular deposits, Capillitium 

 profuse, bright yellow, sparingly branched 

 threads beset with numerous straight or 

 curved spines as long as the diameter of 

 the thread. Spores citron-yellow in mass, nearly smooth, 9 

 /j. diam. 



Hab. On bark, etc. 



Fig. 40. 

 Perich^na populina Fiies. 



a. Group of sporangia. Magni- 

 fied 7 times. 



b. Capillitium and spore. Mag- 

 nified 280 times. 



to IO 



2. P. depressa Libert. — Sporangia depressed, polygonal, 

 crowded, brown, dehiscing with a well-defined lid ; outer layer of 

 the sporangium-wall cartilaginous, inner membranous. Capillitium 

 a web of branching slender yellow threads, 2 ft. diam., minutely 

 warted and constricted. Spores yellow, nearly smooth, about 

 10 fi diam. 



Hab. On bark, etc. 



3. P. populina Fries. — Sporangia subglobose, depressed, crowded, 

 purple-brown or grey, dehiscing with a well-defined lid. Capillitium 

 usually scanty, sometimes reduced to only a few simple or branched 

 free threads. Essentially distinguished from P. depressa by the 

 larger spores, about 13 yu. diam. 



Hab. On bark, etc. 



