545 
three specimens were met with (July 1924) which must probably be referred to the 
same species. They are up to 1.5 cm high with a linear frond, partly bearing numer- 
ous marginal leaflets which 
are often longer and nar- 
rower than in the above 
mentioned specimens; the 
leaflets are all flat and sterile. 
These specimens are all with- 
out base; they were perhaps 
loose. 
A specimen dredged in 
the North Sea NW of Thybo- 
ron in 31 metres’ depth 
was finally referred to this 
species, though with some 
doubt. It is 1.8 cm high, 
branched, with marginal leaf- 
Fig. 529. 
lets, and sterile in August. Phyllophora Trailli. Fladen, 17 metres’ depth. 10 : 1. 
The species has been 
met with at several places on the coasts of the British Isles (comp. Barrers 1902), 
and it has also been recorded from the East coast of the United States by Corrıns. 
Tetraspores are unknown, and the structure and development of the cystocarps 
have not been examined. 
Localities. Ns: aT Thyborøn beacon SE ‘/2 E 14 miles, 31 m. — Kn: Ostero harbour, Læsü. — 
Ke: fH, Fladen, 17 m, October. 
Ceratocolax K. Rosenv. 
1. Ceratocolax Hartzii K. Roseny. 
Kolderup Rosenvinge, Deux. Mém. 1898, pp. 34—39. 
When in 1898 I described a new Alga under the above name, growing parasitic- 
ally on Phyllophora Brodiæi at the coasts of Greenland, I was not aware of the 
fact that the same or a nearly related species had long before been observed by 
LyneByE (Tent. 1819, p. 11). In describing Spherococcus Brodiwi 8, concatenatus, 
this careful investigator characterized it as being set with “verrucis aggregatis, 
uvæformibus, pedicellatis, frondis e margine ortis”’. He did not take these bodies for 
fructifications, as they contained no “semina”. REINKE directed the attention of 
SCHMITZ to these bodies and repeatedly sent him specimens of them from the Baltic 
Sea. SCHMITZ took much pains in examining them and finally arrived at the conclu- 
sion that they must be interpreted as “Produkte parasitischer Florideen’’. “Unter 
der Einwirkung eines ziemlich kleinen intramatrikalen Parasiten-Geflechts entwickeln 
sich traubenförmige Wucherungen des Phyllophora-Thallus; in diesen Wucherungen 
D.K.D. Vidensk. Selsk. Skr., 7. Række, naturvidensk. og mathem. Afd., VII, 4 70 
