22 Dansk Botanisk Arkiv, Bd. 2. Nr. 6. 



as they are known, besides a summarising review of the scattered 

 papers in which the species is dealt with. 



In contrast to the other Cymodoceæ (perhaps C. ciliata ex- 

 cepted) the creeping rhizome of C. antarctica is a sympodium, 

 much like the rhizomes of Potamogeton species. Each shoot which 

 takes part in the rhizome formation, begins as a horizontally 

 creeping rhizome with several internodes; the leaves of the rhi- 

 zome are bracts consisting of a clasping sheath and a diminutive 

 blade, and dorsally just beneath the leaf -scars, two roots appear 

 (Fig. 11) which fasten the rhizome into the soil where it is rather 

 deeply imbedded. After the development of a number of hori- 

 zontal internodes the shoot elevates itself, generally by somewhat 



longer internodes, and it be- 



comes upright, ceasing to send 



(< jf? °^ ro °l s from the nodes; at the 



%yy same time a regular transition 



n — f- ^: ~~"X — — tø^%\ from nearly bladeless bracts to 



\wT " \\ |\ blade-bearing leaves is seen to 



A\n \\ I I * a k e place. The upright assi- 



\\ II I milative shoot may become very 



, T , long (up to 1 m) ; it branches 

 Fig. 11. Cinn. antarctica, from l al- „ ° , , . „ 

 lingup Cave District. Part of the freely, producing short leaf- 

 creeping rhizome, with roots, the base bearing lateral shoots (see Fig. 

 of an erect shoot and the principal 7 ,, n jit 



bud. ( 3 / 4 nat. size.) 10; also well figured by La- 



billardiére) and at the right 

 season the flowers are to be found terminally at the apex of 

 these shoots. 



In the axil of a leaf at the transition zone from creeping to 

 upright, the principal bud which continues the rhizome formation 

 is found (see Figs. 11 and 12). It begins with a very short inter- 

 node showing the scar of the prophyllum, and then follow several 

 elongated internodes of which the two first do not usually form 

 roots. Very often the axil of the next leaf of the shoot also 

 produces a bud which develops into another horizontal rhizome 

 (see Fig. 12 to the left); it is not so strong as that from the lower 

 axil, and sometimes it is checked in its growth remaining short 

 and poorly developed (see Fig. 11). The scale-leaves of the rhi- 

 zomes and the leaves of the lower parts of the upright shoots 

 fall off very quickly leaving annular scars. At the top of each 

 branch of an upright shoot there is a tuft of distichous leaves. 

 The whole upright shoot is evidently of rather short duration, 

 and it breaks off near the ground. According to Tepper, quoted 



