TllICHODKK.MACEI. 357 



239. INSTITALE, Fr. 



Stem none; common mass containing many cavities filled 

 with spores. 



1. effusa, Fr. {no. 756). At roots of Scotch fir. 



/, acariformis is merely a state of Hyjjoxylon cocdncwn, and 

 /. radiata of Coprinus radiatus. 



240. TRICHODERMA, P. 



Peridiura spurious, indeterminate, roundish, composed of 

 interwoven even flocci, at length vanishing in the centre. 

 Spores spread over the disc. 



1. viride, P.; Grev. t. 211. On dead wood, etc. Probably not au- 

 tonomous. 



241. ARTHRODERMA, Ctirr. 



Peridium spurious, indeterminate, roundish, composed of 

 interwoven, strongly constricted, jointed flocci. Spores col- 

 lected in the centre. 



1. Cun-eyi, £.; Micr. Journ. ii. p. 240, On dead leaves and sticks. 



Reasons have been given above for not jjlacing Myxothe- 

 cium here. Myxormia has too compact an excipulum to be 

 placed with Myxoihec'mm, or in this place. 



Fam. v.— ascomycetes. 



Fruit consisting of sporidia, mostly definite, contained in 

 asci, springing from a naked or enclosed stratum of fructifying 

 cells, and forminsr an hvmenium or nucleus. 



