13 
tetrasporangia have been found together with monosporangia by earlier authors in 
this form; I have found the same in Danish specimens in some few cases, but I 
was then usually in doubt whether the specimens ought to be referred to this or 
\\ | 
UA D A 2 
NEUE 
Va VS ‘ IE 5 
Is. 
= 
NN 
RN 
Fig. 40. 
Chantransia virgatula Y, secundata. Plants growing on Porphyra 
umbilicalis at Thyboron. A, much branched plant with mono- 
sporangia. B and C, basal portions of plants. D—F, young plants 
seen from above. 260:1. 
to the foregoing form. They pass 
really, in my experience, gradually 
into each other. 
The filaments are much branched, 
more than in f. luxurians, often 
very much branched, and the 
branches are then usually lying in 
one plane, being secund or oppo- 
site. There is no distinction be- 
tween branches and branchlets. The 
filaments are 7—12 (—14) » thick, 
the cells 1—3 times as long as broad. 
The sporangia are nearly always 
Fig. 41. 
Chantransia virgatula ÿ, secundata. Plants 
growing on Porphyra umbilicalis at Thy- 
boron. A, young plant. B, plant with 
monosporangia. 260: 1. 
monosporous, (13—) 15—20 (—21) » long, (9—) 10—14 (—15) » broad. They are ses- 
sile on the sides of the filaments or terminal and lateral on the branchlets. The 
sporangia as well as the sporangia-bearing branches are often secund, and then sit- 
uated on the upper, inner side of the branches (fig. 40 A), but they may also be 
opposite or at least situated two on the same cell (figs. 39, 41). The basal layer is 
D. K. D. Vidensk. Selsk. Skr., 7. Reekke, naturvidensk. og mathem. Afd. VII. 1. 15 
