422 



Fig. 402. Chaetomorpha bracky- 



gona Harv. a, base of a plant. 



b and c, parts of the filament. 



(About 150:1.) 



others 95 p, and thinner and 

 thicker parts were found in 

 between each other. 



Another form is shown 

 in Fig 403 a, &, c. This has 

 also a vigorous basal disc 

 formed by the through grow- 

 ing of the lowermost cells. 

 The cells in the vegetative 

 part of the filament are nearly 

 as long as broad, shortly 



The figure 402 shows one of these 

 forms. It is fixed to the rocks by 

 means of a vigorous basal disc; the 

 basal cell is long with thick and 

 lamellated wall; it increases in size 

 and is formed by the lowermost cells 

 of the filament gradually growing 

 downwards into the cell below, a well 

 known fact described by ROSEN- 

 viNGE 1 ). The cells in the filament 

 varies in length from about half their 

 diameter to about as long as broad ; 

 they are rarely longer, but it happ- 

 ens that cells occur about twice as 

 long as broad. In this specimen the 

 upper end of the basal cell is 67 /j. 

 broad; the vegetative cell in the 

 filament are about 85 p. broad and 

 the emptied zoosporangia up to 

 150 p. broad. But I may point out 

 that the breadth of the filaments is 

 very varying, even in the same fil- 

 ament; for instance was a filament 

 in some parts 45 IJL thick only, in 



In >>Botanisk Tidsskrift, 

 vol. 18, p. 65, 189293. 



Fig. 403. Chaetomorpha brachygona Harv. 

 Two forms. Comp. text. (About 150:1.) 



