113 



tetrasporangia have been found together with monosporangia by earlier authors in 

 this form; I have found the same in Danisli specimens in some few cases, but I 

 was then usually in doubt whetlier the specimens ought to be referred to this or 



to the foregoing form. They pass 

 really, in my experience, gradually 

 into each other. 



The filaments are much branched, 

 more than in f. liixurians, 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. 40. 



Chantransia virgatiila y, seciindata. Plants growing on Porpliyra 

 Limbilicalis at Thyboron. A , much branched plant with mono- 

 sporangia. B and C, basal portions of plants. D—F, young plants 

 seen from above. 2C0:1. 



Fig. 41. 



Chantransia virgatiila /', secnndata. Plants 

 growing on Porphyra iinibilicalis at Thy- 

 boron. A, young plant. J3, 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 ^), but they may also be 

 opposite or at least situated two on the same cell (figs. 39, 41). The basal layer is 



U. K. D. Vidensk. Selsk. Skr., 7. Riekke, naturvidensk. og matliem. Atd. VII. 1. 



15 



