10 Dansk Botanisk Arkiv, Bd. 2. Nr. 1. 



host-species. In this connection the above statement under 

 E. digitata might be brought to memory, and further that the 

 hitherto known Entorrhiza-species, which seem to be distinctly 

 different, every one is confined to a single host-species. 



The two species of Entoirhiza growing on Scirpus are both 

 characteristic by having spiral lines on the spore-membrane, in 

 this regard differing from the other species of the genus. As stated 

 above they are, however, morphologically well separated, a circum- 

 stance, which was likely to be found, partly because the Entor- 





Fig. 6. a: Bark cells from a root of Scirpus fluitans L., infested by E. Raun- 



kiæriana sp. n. In one cell is seen a spore of the named fungus, in another 



numerous bacteria. ^^. b: The bacteria higher magnified. These bacteria 



were commonly found in our material. 



r/uza-species upon the whole are strongly specialized to their host- 

 plants, and mainly according to the fact that the host-species in 

 question belong to different subgenera, S. pauciflorus being an 

 Euscirpus, while S. fluitans belongs to Isolepis and even by Link 

 is referred to a particular genus, Eleogiton. 



Entorrhiza earicicola Ferd. et Wge. sp. n. 



Aggressu fungi, qui apices radicum tenuium infestat, tumoribus 

 piriformibus vel oblongo-piriformibus, levibus, maximis 3 — 4 mm. 

 longis et 1 — 2 mm. latis, albidis oriundis. Sporis in hyphis hyalinis, 

 deliquescentibus, plerumque tortis acrogenis; episporio primum 

 levi, hyalino, indumento gelatinoso instructo, ad maturitatem, 

 contractione strati gelatinosi, subtiliter ruguloso-undulato, dilute 

 flavidulo. Sporis maturis oblongo-ellipsoideis vel protracte obo- 



