279 
It can support a strong surf and is then living in much polluted water. It attains 
a length of 15cm in the Skagerak, 8 cm in the Limfjord. It has only been collec- 
ted in June to August. Nearly all the specimens bore cystocarpia. It has only been 
found in the saltest waters. 
Localities. Sk: YN, within Bragerne, 5 m; washed ashore on Grønhøj Strand (Miss Ellen 
Moller); Hirshals, mole and reefs, 1—5 m. — Lf: Sallingsund, near Nykøbing, east side of Odden (Th. 
Mortensen, !) and off Gronnerup. In the herbarium of the Botan. Museum at Copenhagen a specimen 
is to be found, labelled Limfjorden Aug. 1869, probably collected by J. P. Jacobsen. 
Some general remarks on the Cryptonemiales. 
1. Intercalary cell-divisions. The species belonging to this order appear as 
a rule to follow with great regularity the rule pointed out by Scumirz') for cell- 
division in Florideæ: that only the terminal cells in the filaments, of which the 
frond is composed, divide by transverse walls. Some cases occur, however, where 
transverse divisions of the segment cells have been noted. Thus, according to 
BREBNER, intercalary transverse divisions take place in Dumontia incrassata in the 
short-celled filaments, which grow out from the basal disc and form the upright 
fronds (see above p.156). Another instance I have noticed in Hildenbrandia prototypus, 
where intercalary divisions may occur in the radiating filaments forming the 
basal layer, which makes itself apparent in the fact that the cells are shorter at 
some distance from the margin than at the margin itself (p. 203 fig. 121). It should 
further be mentioned, that the filaments in several Melobesieæ (Lithothamnion, 
Corallina) terminate in a covering cell, which does not divide, and which forms, 
together with the covering cells of the adjacent filaments, an outer layer, incapable 
of development, the penultimate cell in the filament taking over the function of 
the terminal cell as an initial one. A deviation from the order of succession in 
cell division as noted by SCHMITZ may also be found in some species of Melobesia 
and Lithophyllum, where two or more cortical cells, likewise incapable of division, 
are cut off one below the other at the end of the same mother cell (p. 254 fig. 174 
and p. 264 fig. 184 B)’). 
2. Cell-fusions. Secondary pits, which are commonly found in the Rhodo- 
melaceæ and several other families of the Florideæ *) appear to be altogether lacking 
in most Cryptonemiales. I have only found them in the genus Lithophyllum. As 
1) Fr. Scumirz, Untersuch. über die Befrucht. d. Florideen. Sitzungsber. d. Ak. d. Wiss. Berlin 
1883, p. 216. 
2) Intercalary divisions appear to oceur throughout the whole of the frond, at any rate in the 
perithallium in the genus Porolithon, to judge from the drawings of Mme LEMOINE in BØRGESEN, The 
Marine Algæ of the Danish West Indies, III Rhodophyceæ. Dansk Botanisk Arkiv. II p. 177 and p. 179. 
3) Comp. L. KoLpErup ROSENVINGE, Sur la formation des pores secondaires chez les Polysiphonia. 
Botan. Tidsskr. 17. Bind. Kjebenhavn, 1888, p. 10. 
