44 



CARI. SKOTTSBERG, MARINE ALGiE 2. RHODOPHYCE^. 



gradual decrease in the size of the cells from the centre to the surface: in a section two 

 cells belonging to the layers next to the central one correspond to one of the latter, and 

 so forth (fig. 19 c). Botryoglossum has a polystromatic frond as Neuroglossum, but with 

 strictly isomorphous cells as in Nitophyllum. 



Unfortunately, I ha ve not seen any young cystocarps in Neuroglossum; in my 

 specimens of N. ligulatum there are large mature carpospores filling the broad and low 

 chamber, and the gonimoblast is indistinct. According to Schmitz, Nat. Pflanzenfam. 

 I: 2 p. 412 the sporogenous branches are radiating and prostrate, and fusions are esta- 

 blished with the cells of the central lamella, as in Gonimophyllum, q. v. Agardh's figure, 

 Anal. Algol. Cont. V t. 2 f. 7 a, shows nothing of this, but we have no reason to doubt 





Fig. 19. Neuroglossum ligulatum: a — b very small proliferations (of b tip only ), x 480; C length section through stipe, X 70. 



the correctness of Schmitz' statement. This structure does not seem to have been ob- 

 served in Nitophyllum. Another f eature of some interest is the thick crown on the cysto- 

 carp, present in both species of Neuroglossum. 



The tetrasporic sori are described by Kutzing 1. c. as spread along the margin of 

 the leaf on both sides of the midrib. Schmitz found them »in den oberen Thallusab- 

 schnitten und auf proliferierenden Blättchen zwischen Mittelrippe und Blattrand». I 

 have not seen them on very small leaves in N. ligulatum. De Toni, Syll. Alg. 4: 2 p. 

 678 writes: »sori in foliolis exterioribus evoluti . . . », and in the key to the genera lie 

 has placed Neuroglossum in the division with special sporophylls. This is not correct, 

 and it should be remembered that Nött 1. c. refers Neuroglossum lobulijerum J. Ag., 

 where the sori are developed in marginal lobes, to Nitophyllum violaceum J. Ag. 



Distribution: S. Georgia. 



