123 
times penetrate into one cell. The filaments often branch within the host cell, and 
some of the branches may again become free, growing outwards through the wall 
of the host, and the same occurs with endophytic filaments without branching (in 
fig. 51 the free endings of the haustorial filaments are not shaded). As far as I 
have observed, these filaments do not penetrate from one cell into another, and 
therefore do not serve as propagating organs. The protoplasm of the host cell is 
more or less shrunk and evidently yields nourishment to the Chantransia which is 
thus a veritable parasite. 
À great number of erect filaments are given off from the creeping filaments, 
from the peripheral part as well as the central. As new erect filaments are con- 
stantly produced, a fully developed plant shows 
numerous erect filaments of different sizes, giving 
the plant a cushion-shaped appearance. Most of (ian 
these filaments attain only an inconsiderable eam 
length, the greatest are about 200 » long; they \ 
are either unbranched or bear one or a few : | 
branches which are much shorter than the main APN 
filament. Hyaline hairs frequently occur at the 
ends of the filaments, becoming lateral by the 
continued growth of these. In the lower part of 
the filaments the cells are more or less swollen 
at their upper ends or in the middle. The struc- 
ture of the cell is the same as in Ch. Dumontiæ 
(see p. 124), the chromatophore being stellate 
without pyrenoid, while a body staining inten- 
sely by hæmalum and undoubtedly a nucleus is 
Fig. 51. 
to be seen under the chromatophore. Chantransia cytophaga. A, plant growing on 
Th . I il th id the margin of the frond of Porphyra umbili- 
€ sporangia are alw ays sessıle on e sides calis, to the left two haustoria penetrating into 
of the erect filaments, in their whole length. From the same cell. B, plant growing on the flat 
> side of the frond seen from above, showing 
the first each cell bears one sporangıum, but Very three haustorial filaments. The endophytic fila- 
soon one or two others appear and each cell ments are shaded, their free emerging ends are 
3 à white; p, protoplasm of the host cell. 50:1. 
bears thus usually two or three sporangia, the 
two being as a rule opposite. The latest formed sporangium is sometimes seated 
at a lower level than the other, near the middle of the cell. Terminal sporangia 
were not observed. Nearly all the sporangia were monosporous, very few tetra- 
sporous; the latter were somewhat larger than the other. Possibly some of the 
undivided sporangia were unripe tetrasporangia; I imagine, however, that most of 
them were really monosporangia. 
The structure of the cell and the mode of growth bring this species near to 
Ch. Dumontie; it differs from it ir particular by the intracellular haustoria, by 
shorter, less branched erect filaments, by shorter cells and by the want of terminal 
16" 
