66 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. 



grading rather evenly over into the cells belonging to the carpo- 

 gonial branch ; sometimes also as shown in fig. 66 A the growth of 

 the branch has stopped and a side-branch has then grown out as 

 a prolongation of the mother-branch bearing the cystocarp. The 

 carpogonial branch is composed of 4 — 6 cells; these are shorter 

 than the vegetative ones and contain only a slightly developed 

 inconspicuous chromatophore or only remains of it. The cell- 

 walls of the carpogonial branch are distinctly stained by hæma- 

 toxyline. The cells in the carpogonial branch are about 9 ju thick. 

 In the youngest tips of the plant some younger carpogonial 

 branches occurred and a few with trichogynes still preserved were 

 found in the older part of the thallus perhaps because they had 

 not been fertilized ; the trichogyne had nearly the same form as 

 in N. Schrammi, growing thicker towards the tip (Fig. 66 D). 



The carpospores were about 14// long and 11// broad. 



As to the outer habit, I may add that near the base the 

 thallus grows at first thinner but finally it broadens out again 

 to a small disc, by means of which the plant is fastened to stones 

 and shells on the bottom. 



The plant was growing in shallow water quite near the shore 

 in rather sheltered localities where it swings to and fro following 

 the feeble motion of the sea. It was collected in the middle of 

 February having at that time ripe or nearly ripe cystocarps. 



Only found once on the southern coast of St. Croix: at Long Point. 



Liagora Lamour. 



As is well known J. Agardh has given a survey of the 

 anatomical structure of the species of Liagora. The title of his 

 paper is: "De differentiis in structura frondis, quæ in diversis 

 Liagoræ speciebus observantur" (in "Analecta Algologica", Conti- 

 nuatio III, Lund 1896, p. 96). This paper does not seem to be 

 quite satisfactory most probably because J. Agardh had not 

 sufficient material and has based his description exclusively upon 

 dried material. Several of his species seem to be so closely 

 related that they most probably belong to one another being forms 

 of the same species. In any case it is not always an easy task 

 to determine by means of J. Agardh's description a Liagora-spec- 

 imen. A monograph of this genus would certainly be of much use. 

 Zeh^) has promised such a work, but up till now he has merely 



^) Zeh, W., Neue Arten der Gattung Liagora (Notizblatt des Königl. bo- 

 tanischen Gartens und Museums zu Berlin. Band V, 1913, p. 268). 



