56 



Dansk Botanisk Arkiv, Bd 3. Nr. 1. 



about 12 — 14 /i broad and 22—25// long. At the sninniit of the 

 sporangia a small thickening is often present (Fig. 59). 



The specimens found 

 in Codium isthmocladum 

 agreed in all essentials 

 with those described 

 above, but some small 

 differences were noted. 

 Thus the basal endophy- 

 tic part of the plant 

 was often looser, not so 

 tufted together as shown 

 in the fig. 57 and the 

 endophytic filaments 

 were a little thicker, 

 about 33 fi. Also the 

 erect filaments were 

 somewhat thicker , at 

 their base about 14 — Ibfj. 

 thick, at the apex about 

 6—7;/. 



Several species of 

 Acrocliætium occurring 

 upon Codium have been 

 previously described. The 

 brothers Crouan have 

 found the Acrochætium 

 (Callithamnion) Codii ^) 

 upon Codium elongatum. 

 Of this species Dr. Ro- 

 senvinge has ben able- 

 to examine original ma- 

 terial and has most 

 kindly shown me a fine 

 preparation from which 

 it is clear that my plant 

 has nothing to do with 

 this species. Dr. Rosen- 

 viNGE will later give a 

 description of this plant. 

 1) Crouan, P. L. et H. M., Florule du Finistére, 1867, p. 135 (nomen 

 nudum). Cfr. Bornet, Deux Chantransia corymbifera Thuret (Bull. 

 See. bot. France, Tome 51, 1904, p. XX). 



Fig. 58. Acrochætium phacelorhizwn nov. spec. 



Uppermost part of the basal part with an 



erect ramified sporangiferous filament. 



(About 5U : 1). 



