110 



«, luxurians (J. Ag.)- 



Cnllitliamnion luxurians .1. Agardh S)). U p. 14. 

 Cliantransia luxurians Kylin I.e. p. 117 fig. 26. 

 Callithamnion virgatulum Ckouan Alg. mar. Finist. p 116. 



Chantransia vinjatuln Thuret in Le Jol. Liste p. 106; Kyi, in (1907) p. 116 fig. 25; Bohgesen, M. A. Fwr. 

 p. 351 fig. 52. 



Trcntepuhliu vircjatula Farlow Mar. Alg. New Engl. p. 109 pi. X fig. 3. 



This form which corresponds to the Ch. 

 inrgatiila in the common restriction of the au- 

 thors is the commonest form in the Danish 

 waters. It has two or tliree generations of 

 long filaments, which are straight, up to 2 mm. 

 long, 10 to 14 fj. thick, more rarely up to 16 

 thick or even thicker, consisting of cells 3 to 

 5 times as long as broad. There is a distinct 

 contrast between the long filaments and the 

 branchlets which occur in great number, one 

 or two on each cell of the filaments, in the 

 first case often secund, in the latter usually 

 opposite; they are usually 1 to 3 cells high, 

 unbranched or branched and bear generally 

 two or more sporangia and most frequently 

 also one or more vigorous hairs. The spor- 

 angia are monosporous, ovate or broadly ellip- 

 soidal 17— 21 (—26)/^ long, 13— 16 (—19)^ broad. 



Under this species I have included two 

 forms regarded by Kylin as distinct species, 

 namely Ch. viryatula and Cli. luxurians, because 

 I have not been able to distinguish them after 

 the alleged characters. In most of the Danish 

 specimens the thickness of the filaments varies 

 between 11 and 13 /i , thus within the limits 

 indicated for Ch. luxurians by Kylin, and the 

 dimensions of the sporangia also agree with the 

 measurements indicated for this species. On 

 the other hand , the specimens with thicker 

 filaments, thus agreeing better with Ch. virga- 

 tula Kylin, had not shorter, approximately glo- 

 bular sporangia as indicated by Kylin, but 

 were of the same dimensions. The thickest 

 Fig. 37. filaments were found in some specimens from 



ciuuitransia uirgatuia a. luAnriaiis. A. pari of Lysegruud in Ks (9,5 meters) ; they Varied from 



phiiit with sporangia. B, basal part. C, basal • i • i i • i 



part of young plant. 260:1. 13 to 20 /< HI thickncss , the cclIs wcre thick- 



