620 
host plant. They are all here provisionally regarded as belonging to the same 
species, Conchocelis rosea. 
The specimens shown in fig. 617 grew in Spirorbis sp. attached to Furcellaria 
fastigiata gathered near Frederikshavn in July. The fertile filaments are here thick, 
about 14— 16 w in diameter, and the cells are usually more or less inflated or rounded, 
with convex outer-walls, of the same length as the breadth or shorter, rarely a 
little longer. Longitudinal or intercalary transverse or inclined divisions occur here 
ogg à 
=n SE 
SIR 5 
TR SE 
a ur 
Fig. 617. 
Conchocelis rosea, in lest of Spirorbis sp. from Hjellen near Frederikshavn, treated with picric acetic acid. A, cell 
of long, thin filament, showing nucleus, chromatophores and pit-connections in the transverse walls. B, long fila- 
ment with opposite branches, one with inflated cells. C, branched filament with partly inflated cells. D, row of broad 
cells with distinct flat chromatophores lining the wall. E, fertile cell-row springing from a thin filament, showing 
pit-connection in the transverse walls. F, branched fertile cell-row. G, fertile cell-row, with branch and an oblique 
intercalary wall. H, fertile cell-row the cells of which produce each a monospore. 630 : 1. 
and there (fig. 617 G). The pit connections in the cross walls appeared distinctly in 
these specimens which had been treated with picric acetic acid, the callus button 
in the middle of the wall being intensely stained with hemalum (figs. E—H). 
A young stage is shown in fig. E, where a 4-celled complex of fertile cells is 
seen in continuity with the thin filament from which it has originated. The 
larger bushes of fertile cell-rows may somewhat resemble a frond of Stigonema, 
but the outer wall is firm, not gelatinous. The cell-structure is often difficult 
to observe owing to its dense character. A central nucleus intensely stained 
with hematoxylin was always to be seen but its finer structure could not be 
observed. Many cells with dense contents suggested the presence of a stellate chroma- 
tophore as supposed by Batters and formerly by myself, and the nucleus then 
