Contribution. I. 87 



The typical form not seldom occurs in rock-pools between 

 tides, but here it is always feebly developed. The plant ap- 

 pears in the inner part of deep bays as well as on open and 

 exposed coasts, but it thrives best in somewhat sheltered lo- 

 calities, almost ever gregarious. It attains a length of un- 

 til 3 — 4 m., but is mostly shorter. Specimens with young 

 zoosporangia have been taken in the beginning of August. 

 Distribution: Pretty common along the whole coast, 

 entering the inner end of the deeper bays and at some pla- 

 ces abundant (f. typica); the form subtomentosa, according 

 to my experience, is scarce everywhere. 



Chorda tomentosa Lyngb. 

 Hydr. Dan. p. 74. 



f. typica. 



Descr. Chorda tomentosa Aresch. Obs. Phyc. 3, p. 14. 



Fig. „ „ Lyngb. 1. c. t. 19, fig. A. 



Exsicc. „ „ Aresch. Alg. Scand. exsicc. No. 93. 



f. subfulva nob. 



£ minore, debiliore, pills subfulvis, siccata viridibus; zoosporangiis 

 subelKpticis vel oblongo-linearibus. 



The form that I have called f. subfulva I at first thought 

 to be most nearly related to Ch. abbreviata, which Aresch oug 

 in his Obs. Phyb. 3, p. 15 states to have the habit of Ch. 

 tomentosa. And the spores and paranemata of the first spe- 

 cimens I found were like those of Ch. abbreviata. However, 

 by most of the other specimens, I later collected, the spores 

 and paranemata were in shape almost similar to those of 

 Ch. tomentosa f . typica. K j e 1 1 m a^n has had the kindness 

 to compare it with the original specimen of Ch. abbreviata 

 Aresch., but this species is said to be more like a young 

 and slender Ch. filum. The form subfulva is smaller and 

 more slender than the typical form, attaining a length of 

 about 1 m., though mostly only half the length or less. The 

 hairs are wore tender and their cells shorter than by f. iy- 



