124 



Tromsø Museums Aarshefter 14. 1891. 



vided with sorae other rhizoid loosely connecting the parti- 

 cular branchsystems. Long branches are more numerous 



than short ones consisting of 1 — 8 cells 



as 



by P varia, 



though the latter appear by some specimens in rather great 

 number. The cells are 25 — 30 \l thick, 1 — 2 or seldom 3 

 times the diameter in length, always cylindric with rather 



i 



thick walls. The chromatophores are small but numerous, 

 disk-shaped. The sporangia are mostly terminate in cbains 

 of 2 — 10, sometimes, though very seldom, only one, someti- 

 mes until 18. Intercalar sporangia also occur, but theyare 

 more seldom and few in nmmber, the chains sometimes in- 

 terrupted by 1 — 2 vegetative cells, so that the sporangia 

 partly may be solitary, partly 2 — 3 continuous. Besides I 

 have seen sporangia in this form almost fully agreeing with 

 those in P. varia figur ed by K j e 1 1 m a n in N. Ish. Algfl. 

 t. 27, fig. 6—8, 10 and 12. 



Last summer I again met with a similar form in the 

 same place as the above mentioned one. It appeared in a 

 grotto-shaped, shady cavity at or a little above high-water 

 mark in a much exposed looality. It grew gregariously 

 forming coherent and rather dense but loosely coraposed 

 mats of considerable extent, 2 — 4 cm. in thickness, with so- 

 mewhat curled surface. The layers were composed of nu- 

 merous more or less prostrate and curved tufts until 12 cm. 

 in length. The tufts consist of narrow, twisted bundles, 

 which are upwards more loosely twisted and entangled with 

 one another. The main axis is in general provided below 

 with numerous, more or less elongated rhizoids, which also 

 are to be found, though more seldom, in the upper part of 



t 



the frond. The branches mostly appear irregularly scatte- 

 red, now and then opposite, much curved and issuing in an 

 angle of 45 — 90°, long branches rather numerous and short 

 ones fewer in number than in the preceding form. The 

 cells are 25 \k thick, the length 1—2 (3) times the diame- 



