258 
that it should be referred to another genus: but as other characters justifying its 
removal from the genus es are not known, I prefer to retain it under the 
genus provisionally. The small size of the tetra- 
BER sporangia seems to be a significant mark dis- 
er FRI RE tinguishing it from other species. The want of 
m Na transversal pores between the cells of the vertical 
2 ea} / re ON filaments, and the fact that these cells are not dis- 
ny aa ES] CAE posed in transversal rows, exclude it from the genus 
ki — Sa LEO ; 
SS Lithophyllum. 
Fig. 179. Only found once, growing on the frond of 
Melobesia microspora. Vertical section of  Furcellaria fastigiata, with ripe sporangia, ripe an- 
female conceptacle; at left a carpogonium BEE EEE à 
from another section of the same concep- theridia and carpogonia in April. 
ECO? EE Locality: Sa: PP, Ryes Flak, 5 meters (no: 4670). 
Choreonema Schmitz. 
1. Choreonema Thuretii (Bornet) Schmitz. 
Fr. Schmitz. Uebersicht, Flora 1889, p. 21 (reprint); id. in Engler u. Prantl, Nat. Pflfam. I p 541; Fr. 
Minder, Die Fruchtentwicklung von Choreonema Thur. Diss. Freiburg, s. a. 
Melobesia Thuretü Bornet in Thuret, Etudes phycolog., 1878, p. 96, pl. 50, fig. 1-8; Solms-Laubach, 
Corallinenalgen d. G. v. Neapel, 1881, p. 12, 54, Taf. III fig. 1, 4—10. 
Endosiphonia Thuretii Ardissone, Phycologia mediterranea. I. Varese, 1883, p. 451. 
This interesting Alga, parasitic in Corallina rubens, has been met with in a 
few localities in the Northern Kattegat and perhaps also in the Skagerak. Unfor- 
tunately, the collected material was lost, except that from a single locality near Fre- 
derikshavn; I must therefore content myself with referring to the quoted publications. 
MINDER has in his important paper given a thorough description of the devel- 
opment of the cystocarp, which in essential points modifies the statements of SoLMs- 
LauBacH. After fertilization, the zygote gives off short sporogenous filaments, which 
gradually fuse with the auxiliary cells, but none of the numerous sporogenous 
nuclei enter into these cells. From the marginal lobes of the resulting great sporo- 
phytic cell (which is not produced by mutual fusion of the auxiliary cells, but 
has been nourished by them) the carpospores are produced, becoming cut off by 
watch-glass-formed walls. 
As I have had very few specimens at my disposal, I cannot give any state- 
ment as to the fructification in the Danish waters, 
Localities. Sk (?). — Kn: Within Deget near Frederikshavn (C. H. Ostenfeld), and perhaps a few 
other localities. 
Lithophyllum Phil. 
Subgenus Eulithophyllum. 
1. Lithophyllum orbiculatum (Foslie) Foslie. 
Foslie, Rev.”survey (1900) p. 19 (without mention); Remarks (1906) p. 112. 
Lithothamnion orbiculatum Foslie, Norw. Lithoth. (1895), p. 143, pl. 22 fig. 10—11. 
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