PLANTS OF IOWA 67 



Merulius, Hall. 



827. M. tremellosus, Schrader. 



On various trunks, not uncommon. 



828. M. incamatus. 



On rotten logs in winter. 



829. M. lacrimans, (Jacquin) Winter. 



The far-famed "Dry rot" of the northern world, 

 found everywhere attacking sills and joists in cel- 

 lars, or beneath barns, or bridges, affording us the 

 one surprising instance of a domesticated fungus. 



830. M. corium, Fries. 



Our commonest woodland species. Usually found in 

 patches of several inches extent on the under side of 

 fallen sticks and on ranked cord-wood in the forest. 

 Favolus. 



831. F. europaeiis, Fries. 



Common everywhere on fallen twigs and branches, 

 chiefly on hickory and oak. 



832. F. rliipidhim, Berkeley. 



It occurs in little densely cespitose tufts. 

 Cyclomyces. 



833. C. greenii, Berkeley. 



Rare. On the ground in mossy woodland. 

 Dmdauea. 



834. D. unicolor, (Bulliard) Fries. 



Very common everywhere on all sorts of stumps and 

 logs, railway ties, bridge timbers. 



835. D. pallido-falva, Berkeley. 



Very common on stumps of various species. 



836. D. confragosa, Persoon. 



On dead stems of Crataegus, fallen species of willow and 

 other deciduous trees, common. 



837. D. aurea, Fries. 

 Not common. 



838. D. quercina, Persoon. 

 On oak, not common. 



