132 SYNOPSIS OF BRITISH BEAWBED8. 



11 >h. On the smaller Algse, in tide-pools. Bare. Annunl. Au- 

 gust. 

 C. lecurrens <cvm* to be almost exactly intermediate 

 between C rchri>,n and C diaphanwm. It agrees with 

 the former in size, but differs in haying a translucent Bpace, 

 destitute of coloured cells, in the middle of each internode. 

 From C. diapharwm it differs chiefly in having the lines of 

 coloured cells which clothe the nodes continued over a con- 

 siderable Bpace of the articulation, and thus, as it were, 

 vrrent along the stem. The exact disposition of these 

 cells, and the structure of the stem, is well seen when a 

 longitudinal slice is taken. The minute coloured cells 

 will then be found immersed in the transparent walls of 

 the frond. 



229. Deslongchampsii {Deslongchamps i Ceramivm) ; filaments 

 subsetaceous, attenuated upwards, rigid, irregularly dichoto- 

 mous, with or without lateral ramidi ; the apices Btraight, 

 spreading ; articulations colourless, those of the main stems 

 about thrice as long as broad, of the branches and ramuli 

 much shorter ; dissepiments opaque, scarcely swollen : tetra- 

 spores whorled round the joints, prominent ; favellae (?) 

 heaped together, bursting irregularly from the sides of the 

 branches, destitute of involucral ramidi, Chauvin, Aly. Norm, 

 (Atlas, PI. LII. Fig. 236.) 

 Ceramiimi Agardhianum, Griff. Gongroceras Deslongchampsii, 



Ktz. 

 Hah. On rocks and stones between tide-marks, and on the smaller 

 Alga?. Annual. Spring and summer. 

 A more slender plant than C. diaphanum, of a darker 

 colour and with shorter joints, and further distinguished 

 from that species by the straight tips of the branches, more 

 prominent tetraspores, and above all by the clustered fa- 

 vella?, bursting in irregular masses from various parts of 

 the stem and branches. A distorted variety frequently 

 occurs among normal specimens, and this is very generally 

 furnished with the anomalous fruit. Some specimens are 

 excessively squarrose, with the stem and branches regu- 

 larly bent at short distances, and every ramulus divaricat- 

 ing. 



230. diaphanum (The diaphanous Ceramivm) ; filaments » 

 ceous, attenuated upwards, rather flaccid, irregularly dicho- 

 tomous, the lower forkings distant, the upper close together ; 

 branches set with short, lateral, dichotomous ramuli; arti- 

 culations colourless, those of the main stems three or four 



