only were met with at Hirshals, and in April I did not find it at all in the same 
locality. Further it was not contained in the samples of Algæ from the groins of 
Thyborøn collected and sent to me in March. It 
therefore seems probable that the plants die in au- 
tumn or in winter, leaving only the young plants 
produced by the germinating spores and the basal 
parts of some of the older plants, which pass the 
winter in a resting stage and again take up the 
N 
Wy 
VE 
2) 
ÿ 
= 
Fig. 384. Fig. 385. 
Polysiphonia Brodiei. Sporeling. The Polysiphonia atrorubescens. A, portion of plant near the base; numerous 
figures denote the number of pericentral rhizoids and endogenous branches. B, decumbent branch. C, joint of 
cells in the joints. stem. A, B 26:1. C 68:1. 
growth in spring. Antheridia were met with in all the months mentioned, cystocarps 
and tetrasporangia only in July—September. It grows in exposed places on moles, 
stones and wrecks at middle sea level. In moles and groins it forms a continuous 
vegetation at the ordinary limit of the sea. 
Localities. Ns: Groins at Harboøre and Thyborøn; harbour of Thyborøn, outside. — Sk: Hanst- 
holm, Roshage, stone on the shore; Lanstrup, stones on the shore, Hirshals, mole and reef; wreck by 
Skiveren; Hojen, on pebbles within the innermost shoal and between the first and the second shoal, 
1—4 meters. — Kn: Harbour of Skagen, outside eastern mole. 
