121 



brevem gerentia. Sporangia monospora in filis repentibus sessilia aut in fliis erectis 

 terminalia, ovata vel subsphaerica, long. 7 — 9,5//, lat. 5,5— 7,5 



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, fi). 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, 1). 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- ^ 



Fig. 49. 



Sembling Ch. reducta; but that form c/ianfransiareducfa. ^ and B(Freflerikshavn), creeping filaments 

 differs by a different mode of divi- showing the ichromatophores. C—F, plants in vertical section 

 . . /tx AOS sporangia. G, young plant seen from above. H, more de- 



SlOn of the germmating spore (tig. 48). veloped plant seen from the under side. /, plant seen from 

 The SnecieS has been found ^b*'^'^- fragment of plant in vertical section, with a stalked 

 " ... sporangium. L, fragment of plant with sessile sporangia, in 



growing on Polysiphonia nigrescens vertical section, c-z. from gm. 5G0:i. 



and Rhodomela subfusca collected 



near the low-water mark in the northern Kattegat, in July and September. 



Localities. Kn; Hirsholm ; harbour of Frederiksliavn ; dry rock near Jegens Odde (GM). 



Group III. Frond partly or entirely endophytic. 



16. Chantransia cytophaga sp. nov. 



Thallus csespitosus, ad 0,2 mm. altus, e filis 1" repentibus plantse hospiti af- 

 fixis, 2" erectis sporangiferis et 3" endophyticis constructus. Spora germinans disse- 

 pimento verticali in duas cellulas divisa est quarum utraque filum horizontale 



I). K. I). Viileiisli. Selsk. SUr,, 7. Rielikc, naturviclcnsk. dk mathem. Mil. VII. 1. 



16 



