126 
may be terminal on the long branches. From the first the cells bear usually only 
one sporangium or a sporangium-bearing branchlet, but later further sporangia may 
develop so that a great number of the cells bear two or three sporangia. When 
two sporangia occur, they may be opposite or near to each other, but a spor- 
angium may also be placed under another sporangium or under a branch (fig. C). 
The cells giving off a branch bear frequently a sporangium opposite to it. Mono- 
sporangia were not observed. 
Identical specimens were found in two localities on the north coast of Sealand, 
growing in Dumontia filiformis in the month of May. It cannot be confused with 
any other known species. As to its relation to Ch. cytophaga see this species. 
Localities. Ke: Harbour of Gilleleje, inner side of the mole. — Su: Harbour of Helsingor. 
18. Chantransia Nemalionis (De Not.) Ard. et Straf. 
ARDISSONE e STRAFFORELLO, Enum. delle Alghe di Liguria, Milano 1877 p. 167. 
Callithamnion Nemalionis DE NoTarıs, Erbar. Crittogam. Italiano, no. 952 (c. descript.); ARDISSONE, Pro- 
spetto delle Ceramiee italiche, 1867 p. 17, Tav. I fig. 1—3. 
Acrochetium Nemalionis BORNET (1904) p. XX. 
Chantransia Saviana (Menegh.) ARDISSONE, Phycol. Mediterr. 1883 p. 276 ex parte. 
As shown by Bornet, the Callithamnion Nemalionis described by DE Noraris 
has a system of filaments endophytic in the frond of Nemalion lubricum, on which 
it forms numerous 4—5 mm. high tufts. The same mode of growth was observed 
in a Chantransia growing in Nemalion multifidum at Struer in the Limfjord. As it 
fully agreed with the description of DE Noraris and with his above-quoted original 
specimens, which I have been enabled to examine through the great kindness of 
Dr. BornET, I refer it to the same species without any doubt. ARDISSONE has later 
confused this species with one or perhaps more others under the name of Chan- 
transia Saviana (Menegh.) Ard.; as however MENEGHINI’s description refers to a species 
growing on Zostera leaves and certainly different from DE Noraris’ species, it is 
unwarranted to replace the name of the latter with that of MENEGHINI. 
The plant has long ramified filaments growing widely in the interior of the 
host and here and there sending out through the surface of the host free filaments 
giving rise to new tufts; the number of tufts occurring on the same frond of Ne- 
malion may therefore be very great. The walls of the endophytic filaments are 
often a little sinuous on account of their growth between the cells of the host; 
the cells are usually 8 to 11» thick, 3,5 to 5 diameters long. They contain in the 
middle a narrow belt-shaped chromatophore with a parietal pyrenoid. When the 
endophytic filaments rise from the basal part of the erect filaments they are given 
off from the lower end of the cells while the upright branches are given off at 
their upper end, and a similar polarity is as a rule, though not always, present in 
the endophytic filaments (fig. 54 A). 
The erect filaments greatly resemble those of Ch. corymbifera and Ch. Thuretit; 
they form up to 5mm. high tufts with spread branches which are multilateral but 
