C. Ferdinandsen and Ö.Winge: The genus Entorrhiza C. Weber. ' 



Treides ko v, July 9, 1886 (E. Rostrup). Spores 19—24^ 



16—21 fi. 



Klitmøller, July 1894 (E. Rostrup). The more coarsely 



warted spores 20—22 ^ \Th— 19//. 



Further Lind (1. c. p. 271) reports: Sæby (E. Rostrup) and 



Frederikshavn (Lind). 



Bornholm: Lind (1. c. p.271) reports: Almindingen (E. Rostrup). 



E. digitata Lagerh. 



To this species must be referred three numbers, all collec- 

 ted by dr. C. H. Ostenfeld on the western coast of Jutland. 

 The two numbers (Fanø and Tværsted) were found on a plant 

 of the J uncus articulatus-grou]), which dr. Ostenfeld believes to 

 be a distinct form of J uncus alpinus Vill. He has friendly 

 communicated to us that the infected specimens of this Juncus 

 on the Fanø -locality grew mixed together with plants of 

 J. atricapillus Drej. and J. lamprocarpus Ehrh. without these two 

 species being found infested by the fungus. The third specimen 

 of this Entorrhiza was found on a seedling of a Juncus articulatus 

 s. lat. impossible of a closer determination ; on the locality (the lake 

 Ferri ngsø near Bovbjerg) the Juncus alpinus-iorm in question 

 may very well occur, and it is thus probable that we also 

 here are dealing with this plant. Lagerheim 1. c. gives as host- 

 plant /. articulatus. Judging from the localities (Titisee Ge r ma- 

 nia e, Pontresina Helvetiae) it is probable that under this collec- 

 tive species-name is hidden a Juncus alpinus4orm, the Entorrhiza- 

 species showing to be very specialized to single species of host-plants. 

 In the following are given the localites and some details of 

 the fungus. 



Jutland: Ferringsø, July 1893. On a seedling of »Juncus arti- 

 culatus« (C. H. Ostenfeld). Lind (1. c. p. 271) reports this 

 specimen as Entorrhiza Aschersoniana on Juncus bufonius in 

 accordance with a label written by the late prof. E. Rostrup. 

 Spores as described in the specimens from Fanø, 17 1 / 2 — 22// 

 diam. 



Tværsted, strand dune, Aug. 10, 1912. On Juncus alpinus 

 Vill. forma (C. H. Ostenfeld). Exactly agreeing with the 

 following. 



Fanø, near Nordby, Oct. 15, 1912. On Juncus alpinus Vill. 

 forma (C. H. Ostenfeld). 



