307 
in the Skagerak and the northern Kattegat. The tetrasporangia are formed, as shown by 
BATTERS, in the upright filaments by longitudinal division of a somewhat swollen 
cell into two parts of unequal size, the larger forming the tetrasporangium, the other 
part remaining sterile. The longitudinal wall is often somewhat inclined, the lower end 
of the sterile cell being broader than the upper. While the sterile cells contain nu- 
merous coarse starch grains, the developing tetrasporangium becomes dark-red and 
with more fine-granular contents. The tetrasporangium is first divided by a hori- 
zontal, slightly inclined wall and then by two nearly yertical walls. The ripe spor- 
angium is much swollen; it opens by a split op- 
posite to the sterile cell. As shown in fig. 215 bis 
the sporangium is connected with the sterile cell 
through a pit in the middle of the longitudinal 
wall. The sporangia may be solitary or 2 to 6 
together and then variously orientated, always se- 
parated from the apex of the filament by a varying 
number of sterile cells. The sex-organs are un- 
known. 
BATTERS thought that this Alga was identical 
with Callithamnion intricatum J. Agardh. If he has 
founded this supposition only on the short des- 
criptions of C. AGarDH (Syst. Alg., 1824, p. 132) and 
J. G. AGarpx (Spec. g. ord. II pars I, p. 19), it must 
be said that these descriptions are too incomplete 
to allow of an identification, and the plant re- 
presented in Kürzıng’s Tab. phyc. 11. Band, Tab. 62,11 
is evidently another species, being much coarser 
and showing no gland cells. Two specimens in the 
herbarium of the Botan. Museum of Copenhagen 
from J. AGARDH, determined as Callithamnion intri- 
Fig. 215 bis. 
x Trailliella intricata Batt. Parts of filaments 
catum and collected at Koster Bahusiæ and at with tetrasporangia. A 390:1. B 230:1. 
Kullaberg, turned out to be Spermothamnion repens. 
As long as the sex-organs are unknown the systematical position of the genus 
remains uncertain. The position and development of the tetrasporangia remove it 
from the other genera of Ceramiacee; the genus in this respect somewhat reminds 
one of the Rhodomelacew. 
The species has been found more or less abundantly in numerous places in 
the Limfjord and the northern part of Kattegat, and recently in several places in 
the North Sea and Skagerak. It was first met with in the Western part of the Lim- 
fjord in 1901 but has not been observed there before that year, although numerous 
7 KyLiN has recently (Botan. Notiser 1922 p. 346) given a drawing of a tetrasporiferous plant 
after a slide from Batrers kept in the herb. AGarpu in Lund, not being acquainted with the drawing 
given by Barrers in Journ. of Botany 1900. 
