C. Ferdinandsen and Ö. Winge : The genus Entorrhiza C. Weber. 9 



Fig. 3. E. Raun- 

 kiæriana sp. n. 

 Tumours in 



late as March 10 the curved appendix persisted in nearly all the 

 spores, and no germination was to be seen. 



As to be exspected the species has a considerable resemblance 

 to E. scirpicola on Scirpus pauciflorus Lightf., but 

 differs distinctly from this as well by the shape 

 of the tumours as by the spore-form. In E. scirpicola 

 the tumours are cylindrical (fig. 5) while in our spe- 

 cies ovoid or often constricted as the silique of 

 Crambe maritima L. (fig. 3). Further the spores in 



E. scirpicola are less slen- 

 der (16—20 « 11—14 ft) 

 than in E. Raunkiæriana 

 (18—21 « 9—11//), the 



proportion between 

 length and breadth of 

 the spores in the two »•£**£» 

 species thus being re- About nat. size. 



spectively 1,5 : 1 and 

 1,9 : 1 (fig. 4 and 5). We have not 



succeeded in procuring type-specimens 

 Fig. 4. E. Raunkiæriana sp.n. • • , i ^-u u u j 



Spores, one of which showing of E. scirpicola, but still we have nad 

 in optical section the outer occas i on to examine this species ; in the 

 structure of the membrane, ,, ,. P tl ,-» * • i -km 



and another showing the same collections of the Botanical Museum 

 structure in transverse section. f t jj e Copenhagen University are 

 ~ T " found, namely, specimens of the fungus 



on Scirpus pauciflorus from the Færoes (Tran- 

 gisvaag on Suderø, leg. C. H. Ostenfeld); 

 E. Rostrup (1901, p. 306) identified the plant 

 with E. cypericola (Magn.) De Toni. In these 

 specimens, though being very young, so that 

 the spiral lines of the spore-membrane just 

 are going to appear, the proportion between 

 length and breadth of the spores still is exactly 

 as stated by Correns, the young spores mea- 

 suring 15 ^ 9 [x. 



The record of this fungus from the (Correns) Sacc. & Syd 



s 1— 3 : Rootswellmgs ! 



Færoes, being so lar away irom the hitherto on Scirpus pauciflorus 



only known locality, Val Maggia, Tessin, Lightf.; 4— 5: Spores 

 _ J . .i • • .t 4.U from above and from 



Switzerland, suggests the opinion that tne the side; 6: Spore from 



distribution of the Entorrhiza-species is coin- above treated with 

 . , „ , . , , , ., cone. Hr, S(J 4 . 1 — o : 



cident with that of their host-plants and that i^ . 4 _ 6: soo. 



the species are closely specialized to single After C. Correns. 



Fig. 5. E. scirpicola, 



