102 



ft, agama var. nov. 



In Ihe Danish waters plants only provided with sporangia are much more 

 frequent than the above described sexual plants. As they greatly resemble these, 

 I conclude that they belong to the same species; as they are dill^rent, however, 

 not only by the want of sexual organs but also by somewhat larger sporangia 

 they may be mentioned separately; and this will appear all the more legitimate 

 when we remember the great likeness between the sporangia-bearing filaments of 

 Ch.Thuretii and those of Ch. corijmbifera Thur. (Bornet et Thuret 187(j pl.V), so 

 thai it is not excluded that the specimens mentioned here might represent a sep- 

 arate species. 



As to the vegetative organs this form agrees with the sexual plants; the prin- 

 cipal filaments, however, 

 are as a rule a little 

 thicker, namely 8 — 11 // 

 in diameter. In some 

 cases the thickness rea- 

 ched 12 fj., and in some 

 specimens from the North 

 Sea (aF, fig. 32 F) it at- 

 tained even 13 f/. On the 

 other hand principal fila- 

 ments only 7 fj. thick may 

 also occur. The cells are, 

 as in the sexual plants, 

 rather thick - walled ; in 

 the lower part of the fila- 

 ments they are propor- 



lowi'i- iKii l III M |il;uil: nl)<)ve a l)i ;inclilet Willi hiiIIr-i idiii ;ind a carpogoniuiii. tionally short (seldom 

 D, lower pail ol a :plaiit wilh two slmrt desceiuliiiy lilainents. A, li 5(iO : 1, i t • 



c, /j:i5(i:i. however so short as in 



fig. 32 A), upward longer. 



The branches are somewhat thinner than the principal filaments and become 

 thinner towards the apex. Sometimes they taper into very thin hair-like threads 

 consisting of long, thin cells, the contents of which become colourless (fig. 32 B;; 

 this may also occur in a. Descending filaments at the base of the plants were not 

 observed in tyjiical specimens of this form. The chromatophores have the same 

 shape as in the sexual plants. 



The sporangia have the same position and shape as in the sexual form but 

 are somewhat larger. The length is usually 19 — 22 ^, but it may attain 24 /i and 

 may sometimes be only 17,5/7.; the breadth varies between 8 and 12//. (7 — 13 /7). 

 Only once have I seen a sporangium or a sporangium-bearing branchlet situated 

 beneath another sporangium on thejsame cell (fig. 32 C, comp. fig. 30 A). In spec- 

 imens collected towards the end of September in the Northern Kattegat (TP), 



Fig. 31. 



Clmnlninsia Thurctii a, amphicarpa. l-"roni Bussercv by"Fre(leriUsliavii. .1, llic 

 liraiiclilel hears ;i earpogoniuni . an anilieridiiim and a s])iiran^i;i iini. />', Ihc 

 liranelilcl liears a lerniinal car|)0;{oniuin and a lateral emptied sponingiiini. C, 



