40 
Fig. 233—243 
Fig. 244 —252 
Fig. 253—263. 
Fig. 264—273 
Fig. 274—289 
Fig. 290—294. 
Fig. 295—305. 
HENRIK PRINTZ [1920 
. Hormidium flaceidum Braun f. cellulis passim 
tumid:is. 
PI. VII. 
. Trentepohlia aurea (L.) Mart. forma. 
Fig. 244, 245, 246, 250, and 252 show filamenits with 
gametangies, the first mentioned one with a partly 
emptied gametangium. Fig. 247, 249, and 251, vege- 
tative filaments showing ramification and apical 
cells. 
- PI. VII. 
Trentepohlia aurea (L.) MART. forma. 
The figures show the ramification of the filaments, 
apical cells, and shape and arrangement of the 
gametangies. In fig. 260, an emptied gametangium, 
the point of which is drawn out into an abnormally 
long beak. 
PI. IX. 
+ Trentepohlia umbrina (Körz.) Born. 
Fig. 264—272, cells of various age, partly forming 
akinetes. Fig. 273, gametangies. 
PL X. 
. Trentepohlia umbrina (Körz.) Born. 
Fig. 274, 279, and 285, emptied gametangies. Fig. 
282, gametangium. For the rest, vegetative cells in 
akinete-formation. 
PI. XI. 
Phycopeltis arundinacea (MonT.) DE Toni. 
Fig. 290, a very young thallus, consisting of seven 
cells. Fig. 291—292, young thalli, the last one with 
a disc-sporangium. Fig. 293 shows the edge of two 
dises' having come in contact with each other. Fig. 294 
shows the regular structure of an older thallus; the 
cell-rows are regularly dichotomously ramified. With 
dise-sporangies. 
PI. XII. 
Phycopeltis flabelligera (De Tonr) Hanse. 
Fig. 295, 297, 299, 300,and 302 are isolated filaments. 
The rest of the figures are parts of larger thalli, 
showing their irregular construction with isolated 
filaments and irregular circumferenees. 
