29 



audi einige grosse Uhrglaszellen angelegt, die zu kleinen Tochter- 

 blasen auswachsen konnen. Diese wenig in die Augen fallenden 

 Zweigblasen haben hier die Aufgabe, die Hauptblase auf ihrer 

 Unterlage zu stutzen und besser festzulagen«. Also in my spe- 

 cimens I have found some few of these cells grown out to small 

 daughter cells which again were provided with a single or a few 

 small lentiform cells with rhizoids. How far these cells are able 

 to grow out to large cells like the mother cell I cannot tell ; but 

 most probably this is the case. 



The wall of the cell is very tough and elastic ; its surface 

 is evidently striated. It shows in the living plant a very nice 

 iridescence, often preserved also in the dried specimens. 



In the wall-plasma we find the plate-formed chromato- 

 phores ; they are irregularly polygonal with more or less elon- 

 gated corners and forming in this way a net-work (Fig. 16 e). 

 A rather large pyrenoid is found in each chromatophore, as pointed 

 out both by Murray and Kuckuck. Below the chromatophores 

 we find the numerous, rather regularly distributed nuclei. 



All the specimens I have collected and examined were in 

 a vegetative state ; the fructification most probably takes place 

 at another season than when I have collected in the West Indies 

 (Dec. — April). But among the rhizoids of a few specimens I 

 have found some quite young plants with only one or a few rhizoids 

 (Fig. 16 a) and these I think originate from germinated zoospores. 



In some few specimens I found the cell-contents accumu- 

 lated in a number of ball-shaped bodies of larger and smaller 

 size, an appearance also common in many related forms. Murray 

 mentions them also (1. c. p. 50 — 51). He considers them as »the 

 normal reproductive organs of Valonia«. In this I cannot agree 

 with him : these bodies are possibly a kind of aplanospores 

 which the plant develops most probably under not quite normal 

 conditions. 



This species is very common in the seas round the Danish 

 Islands ; it occurs both in more sheltered and also on exposed 

 coasts and in shallow as well as deep water down to a depth 

 of more than 30 meters. It is most often attached to stones and 

 shells etc., but may also be found growing upon other algee. 



Geogr. Distrib. West Indies. 



2. Valouia macrophysa Kutz. 



KiJTziNG, Phycologia generalis, 1843, p. 307; Species Algarum, 1849, 

 p. 507; Tabulae phycol., vol. 6, tab. 87, fig. 3. J. Agardh, Till Algernes 



