brevem gerentia. Sporangia monospora in filis repentibus sessilia aut in filis erectis 
terminalia, ovata vel subsphærica, long. 7—9,5 y, lat. 5,5 —7,5 y. 
The erect filaments are extremely reduced in this species; only in Ch. Macula 
among the epiphytic species here mentioned are they as much reduced. In most 
cases the reduction process is carried so far that the erect filament has completely 
disappeared, and the sporangium is situated directly on the creeping filament, or 
it is represented by a single stalk-cell. The erect filaments, however, may be some- 
times two- or three-celled, and I have, though very rarely, seen such filaments 
bearing a unicellular branch (fig. 49 C). In hardened material a parietal chroma- 
tophore with a large pyrenoid was easily visible; the latter were apparently lying 
in the median line of the cell, but 
were, in some cases at least, cer- 
tainly excentric (fig. 49 A, B). The 
two cells resulting from the division 
of the germinating spore remain 
easily recognizable by their greater 
breadth and rounded outline (fig. 49 
A, G, H, I). In this mode of germi- 
nation the species recalls Ch. humilis 
(p.117) which has also little deve- 
loped erect filaments, but this spec- 
ies differs by its greater dimensions, 
by two or three erect filaments given 
off from each cell in the basal layer, 
and by stellate chromatophores. The 
Ch. leptonema just described may also 
occur in a much reduced form re- 
2 Fig. 49. 
sembling Ch. reducta ; but that form Chantransia reducta. A and B (Frederikshavn), creeping filaments 
differs by a different mode of divi- Showing the chromatophores. C—F, plants in vertical section 
z 5 5 with sporangia. G, young plant seen from above. H, more de- 
sion ofthe germinating spore (fig. 48). veloped plant seen from the under side. J, plant seen from 
The species has been found above. K, fragment of plant in vertical section, with a stalked 
P sporangium. L, fragment of plant with sessile sporangia, in 
growing on Polysiphonia nigrescens vertical section. C—L from GM. 560:1. 
and Rhodomela subfusca collected 
near the low-water mark in the northern Kattegat, in July and September. 
Localities. Kn: Hirsholm; harbour of Frederikshavn; dry rock near Jegens Odde (GM). 
Group III. Frond partly or entirely endophytic. 
16. Chantransia cytophaga sp. nov. 
Thallus czespitosus, ad 0,2 mm. altus, e filis 1° repentibus plantæ hospiti af- 
fixis, 2° erectis sporangiferis et 3° endophyticis constructus. Spora germinans disse- 
pimento verticali in duas cellulas divisa est quarum utraque filum horizontale 
D, K. D. Vidensk. Selsk. Skr., 7. Række, naturvidensk, og mathem. Afd. VII. 1. 16 
