really terminal sporangium another lateral is often developed, inserled at the same 
level. The sporangia are entirely immersed or only a little prominent above the 
surface of the host; they are about twice as long as broad. 
Locality. Kn: Tonneberg Banke, TP, 16 meters, September. 
Subgenus Grania. 
Group IV. Frond epiphytic (or partly endozoic); chromatophores long, usually spiral- 
shaped, more than one; carpogonia often intercalary, carpospores seriate. 
23. Chantransia efflorescens (J. Ag.) Kjellm. 
KJELLMAN, N. Ish. algfl. p. 166 (Alg. Arct. Sea p. 129) tab. 12 fig. 1—2 (f.tenuis Kjellm.); Gran, Kristianiafj. 
Algefl. p.19 tab. I fig. 1—3; E. LEHMANN, Beitr. z. Kenntn. yon Chantransia efflorescens J. Ag. sp., Wiss. 
Meeresuntersuch. N. F. 6. Bd. Abt. Kiel 1902 p.1, Taf.1; BORGESEN (1902) p.355; KyziN (1906) p. 113. 
Trentepohlia Dawiesii a. ARESCHOUG, Phyc. Scand. 1846 p. 117. tab. V D. 
Callithamnion efflorescens J. AGARDH, Sp. Vol. II p. 15. 
Rhodochorton chantransioides REINKE, Algenfl. p.23, Atlas Deutsch. Meeresalg. Taf. 21. 
Much has been added to our knowledge of this interesting Alga during the 
last thirteen years. GRAN described the sex-organs in 1896, showing that the for- 
merly known clusters of spores were cystocarps. According to Gran and other 
observers the sexual plants do not bear sporangia; but later, sporangia have been 
observed on other individuals supposed to belong to the same species. Thus, in 
1902 E. LEHMANN recorded monosporangia-bearing plants growing together with 
sexual plants on stones in the bay of Kiel, and in the same year BORGESEN men- 
tioned similar plants with monosporangia found at the Faeroes, while sexual plants 
were not met with. Finally, KyziN has shown in 1906 that Rhodochorion chan- 
transioides REINKE belongs to this species, representing an asexual generation pro- 
vided with tetrasporangia. KyLiN doubts, however, that the asexual plants men- 
tioned by LEHMANN and BorGESEN ought to be referred to this species, as they bear 
monosporangia and have somewhat thicker filaments than the Swedish specimens. 
Referring to the careful description of the species by Kyrın, it must be pointed 
out that I do not fully agree with this author in the delimitation of the species, 
as I have found that it may have monosporangia as well as tetrasporangia, and 
that the filaments may often be somewhat thicker than stated by him. While the 
filaments according to KyziN are 5 y thick, I have found, on the basis of a great 
number of measurements, that in plants from all Danish waters they are usually 
5—6 w thick, but that the thickness varies from 4 to 7,5 ». My observations are 
not sufficiently numerous to allow any certain conclusion as to the influence of the 
outer conditions upon the thickness; I shall only state that the specimens from 
the Baltic were 4—5 » thick, while plants collected in the North Sea in 38 meters 
depth were 64 thick. 
The germination, which was hitherto unknown, has been studied in specimens 
growing on the theca of a hydroid polyp, collected in the Samso Waters (YV) in 
