68 
dividing into two, the one lying over the other at the one side of the cell. Then 
the chromatophore divides after a longitudinal plan into two of unequal size lying 
side by side (Fig. 8 D); the larger later moves upwards and is taken up in the 
spore together with the upper nucleus (Fig. 8 E, F). In the lower chromatophore 
the pyrenoid is very small and indistinct shortly after the division, while the upper 
contains a large and distinct pyrenoid; it is therefore probable that the original 
pyrenoid passes undivided over into the larger chromatophore, while a new pyrenoid 
is formed in the smaller. The fructiferous cells contain many small starch-grains 
which stain dark-violet with iodine; they are to be found in the sporangia as well 
as in their sister-cells. The sporangium is in general smaller than its sister-cell; 
when the mother-cell is very short, however, they 
à i can be of equal size or even larger. As shown by 
a THURET and BERTHOLD, the under-lying cell, after 
is the evacuation of the spore, expands and occupies 
= 
the place of the original mother-cell, and the pro- 
cess of spore-formation may be repeated. 
The plant has been found in almost all Danish 
waters excepted the Baltic, as a rule, however, only 
in small quantities and therefore not conspicuous. 
In greater quantity only found at Struer, in the 
Limfjord, (Sept. 1890) and in the harbour of Frede- 
rikshavn (particularly in August 1891 and July 
1896). It is a summer Alga, nearly exclusively met 
with in the months July to September; it has how- 
ever also been collected in winter (Nov. and Jan.). 
It has been found fructiferous in all the months 
Fig. 8. named. It does not like much agitated water; it 
A ROE CTE on es hag dean found most frequently and in greatest 
and bases of plants attached to Porphyra. fo) 
380:1. D—F, fructiferous cells; in D the quantity in harbours, on piers and the like, in 
chromatophore and the nucleus have re- 3 
cently divided, in E and F the sporangiad Small depths, but it has been found down to 19 
Gall! hes bean GH Gi Bl, meters. It is always epiphytic and has been found 
growing on a number of different Algæ, e. gr. Polysiphonia nigrescens and violacea, 
Ceramium rubrum, Brongniartella, Bryopsis, Porphyra umbilicalis and many others. 
Localities. Sk: SY, off Løkken, 13 meters. -- Lf: Harbour of Struer; Sallingsund, at Glyngøre 
and off Snabe, 4—6 meters: LS, off Arnakke, 7 meters; MI, off Ejerslev, 4 meters. — Kn: Herthas Flak, 
19 meters, (Borgs.): harbour of Frederikshavn; Borrebjergs Rev; Nordre Ronner; GM, 6 meters. — Km: 
BL, 9,5 meters; BH, off Gjerrild Klint, 4 meters. — Ks: Holbæk Fjord. — Sa: Kalo Rev; Hofmansgave 
(Lyngbye, Hofm. Bg.). — Lb: Harbour of Middelfart. — Su: BQ, off Ellekilde, 5,5 meters; PZ, E. of Hveen. 
Porphyropsis gen. nov. 
Frons initio pulvinata parenchymatica, dein vesiculosa et ruptura in mem- 
branam monostromaticam expansa. Spore (gonidia), ut in Erythrotrichia, divisione 
obliqua in cellulis frondis gignuntur. Reproductio sexualis ignota. 
