150 
(not typical). d Kronborg (f. divaricata, C. Rosenberg). — Bw: « Egernsund; Pols Rev; LC, off Gulstav. 
— Bm: « common. y Præstø Fjord, Tromnæs, Falster (O. Paulsen). — Bb: «: 0—11 m depth, up to 
8,5 cm long; in several places with tetrasporangia, sexual organs and cystocarps not observed. 
5. Polysiphonia Brodiæi (Dillw.) Grev. 
Harvey in Hooker, Brit. Flora Vol. II part I, 1833, p. 328; Harvey, Phyc. Brit. Vol. II, 1849, Pl. 195; 
J. Agardh, 1863, p. 993; Kützing, Tab. phyc. 14. Bd., 1864, Taf. 1; Kny, 1873, p. 103; Schwendener, 
Monatsber. d. Ak. Wiss. Berlin 1880, p. 333; Falkenberg, 1901 p. 34 Taf. 21 Fig. 12; Kolderup Ro- 
senvinge 1902, p. 342, Taf. VI Figs. 1—2; id., 1903, p. 444 and p. 457; L. Batten, 1923, p. 303, 
figs. 61—63. 
Conferva Brodiei Dillw. Brit. Conf. 1809, pl. 107. 
Hutchinsia Brodiwi Lyngb. Hydr. 1819, p. 109, pl. 33 B; Flora Dan. 1840, tab. 2312 (?). 
Polysiphonia penicillata (Ag.) Kützing, Tab. phye, 14. Bd., Taf. 1. 
The erect shoots, with the exception of the primary shoot, issue from a system 
of creeping filaments with short articles, partly as continuations of these, partly as 
endogenous branches of them. The creeping shoots bear no trichoblasts but numer- 
ous rhizoids, and such organs may also be produced in abundance from the lower 
part of the erect shoots. These shoots, which are very flexible, on the Danish coasts 
attain a length of more than 20 cm; in almost their whole extent they bear a 
number of penicilliform shoots which are mostly much shorter than the main 
shoots. Long shoots are principally given off from the lowermost part of the prim- 
ary axis; they are usually shorter than this, and transitional stages between the long 
and the short shoots frequently occur. 
The trichoblasts of the erect shoots are arranged in a spiral almost always 
turning to the left. As shown by me (1902, p. 342), the spiral in 165 sporelings in 160 
cases turned to the left, in 4 or perhaps 5 cases to the right 
(2,5 and 3 per cent respectively), and in the numerous full- 
grown plants examined I have met with one shoot only with 
a spiral turning to the right. According to Kny, the angle of 
divergence was, in plants from Cherbourg, '/, of the circum- 
ference, between the first trichoblasts of the shoots, however, 
1/4. In the Danish specimens I found the divergences varying 
about !/,, from a little greater than !/, to a little smaller than 
!/;, most frequently nearly 1/4, and that not only at the base 
of the shoots. In the sporelings the divergence was !/;. The 
first trichoblast appeared on the 5th to the 8th joint, and hence- 
forth each joint bears a trichoblast (fig. 384). 
The trichoblasts show the usual structure; they are well 
developed and are kept comparatively long. The primary branch- 
Fig. 376. es (II) are alternate in two lateral series converging towards the. 
ROBIN ROUE axis, the branches of the second order (III) are likewise alternate 
Trichoblast seen from the ÿ x x à à É: 
back. 200 : 1. in two series converging towards the primary axis of the tricho- 
