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1894, p. 361; id. 1895 pp. 6, 13, 15, 23, 29, 34; id. 1899. Gomont Actinoc., Journ. de Bot. 1894, 
p- 2; R. H. Phillips 1925, p. 244; H. Printz 1926, p. 60; L. Kolderup Rosenvinge, Phyllophora 
Brodiæi and Actinococcus subcutaneus. D. K. Vid. Selsk. Biol. Meddel. VIII, 4. 1929; Hugo Claus- 
sen, zur Entwicklungsgesch. v. Phylloph. Brodizi. Ber. deut. b. Ges., Bd. 47, 1929, p. 544; Kylin 
1930, p. 26. 
Fucus Brodiei Turn. Hist. Fue. II. 1809, p. 1, tab. 72 (good pictures), Hornemann, Flora Danica, tab. 
1476 (1813) (good pieture with numerous nemathecia on narrow sexual shoots). 
Spherococcus Brodiwi Agardh Syn. Alg. Scand. 1817, p. 27; Lyngbye Tent. 1819, p. 11, tab. 3. 
Chondrus Brodici Greville (1830), p. 133. 
Coccotylus Brodiei Kützing Phyc. gener. (1843), p. 412, Tab. phyc. Bd. 19, Taf. 74. (1869). 
For the nemathecia: 
Chetophora membranifolii Lyngb. ms. (Tent. 1819, p. 11). 
Chetophora subcutanea Lyngb., Flora Danica, tab. 2135, 2 (1834). 
Rivularia rosea Suhr mscr. (according to Kützing). 
Actinococcus roseus Kützing, Phyc. gen. 1843, p. 177, Schmitz, Flora 1889, Flora 1893. 
Actinococcus subcutaneus (Lyngb.) K. Roseny. (1893), p. 822, Schmitz Flora 1893. 
The fronds arise from the basal disc the development and structure of which 
are described at length by DARBISHIRE (1895, pp. 15—20). In young plants a single 
frond is given off from the disc, later several fronds may spring from the same 
disc. As shown by this author, hapters may be produced from the under face 
of the disc and penetrate into the substratum, for instance shells of bivalves. The 
A young fronds are to begin with cylindrical 
À but early become flattened above. The flatten- 
{ | ing may begin near the base or there may 
be a long cylindrical stem before the flatten- 
ing begins. Some of the fronds represented 
in fig. 497 show narrowings, often occurring 
in the species but in this case probably not 
) due to the influence of the winter. The rami- 
fication by dichotomy may begin in the first 
year, but often the first branching does not 
take place till the second year (fig. 498 c). 
Lateral ramification of the flat frond as in 
fig. 497 c only rarely-occurs in the first year. 
Only one or two dichotomies are produced 
Fig. 497. in one season. Adventitious shoots or proli- 
Phyllophora Brodiei young fronds, a—cfrom Holsts | ferations are later offen produced from the 
Banke north of Als, June; d—h from fR, Lange- 
lands Belt, August. 8 : 1. cylindrical stem or from the flat frond. 
The growth is arrested in winter (No- 
vember to January). The young flat frond has then a growing zone in the upper 
margin of the frond or of each section of the frond. After the winter rest the 
growing zones resume their activity, and the difference between the old and the 
new frond is then very conspicuous, the first being darker, somewhat brownish, 
while the new segments are bright red. The growing margin may be long, and 
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