KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. N:0 8. 43 



species, and Capt. Crozier had nothing whatever to do with the Australian plant. The 

 latter was collected by B. Wilson; a fragment of the frond, seen from the surface, is 

 illustrated in fig. 18 f (Port Phillips, Herb. Agardh no. 31109). The material is cysto- 

 carpic and homogeneous (Kylin in letter to the writer). But then, how are we to ex- 

 plain the peculiar figure published by Agardh in Anal. Alg. Cont. V t. 3 f . 7? The descrip- 

 tion says it is a section through a cystocarp. In his diagnose of the genus Agardh de- 

 scribed the branches of the gonimoblast as decumbent along the bottom of the cystocarp, 

 bundles of spore-producing filaments arising in tufts, and this he pretends to show in the 

 figure cited. I can not understand this figure: it is no cystocarp, but looks like a fold 

 of the thallus, embracing tufts of moniliform chains and long sterile threads (of an epi- 

 phyte?) growing out of a very anomalous orifice. And in the figure the frond does not 

 show the structure of Platyclinia, but of a typical Nitophyllum, while I can assure that 

 Wilson's plant is a Platyclinia. 



The cystocarp of P. fuegiensis has the structure of Nitophyllum, and the radiating 

 filaments of the gonimoblast do not become connected with cells of the central lamella. 



Distribution: In the sea E. of Fuegia. 



Neuroglossum Kutz. 



N. ligulatum (Reinsch) Skottsb., Kylin & Skottsb. p. 37. — Fig. 19. 



South Georgia, sublitoral: Cumberland Bay, Boiler Harbour 5 m (St. 

 48, 20. 4. 09); Bay of Isles, Rosita Harbour, 8 m (St. 52, 25. 4. 09, ?); Moraine Fiord, 

 in beach drift (18. 4. 09, ©), small specimens epiphytic on Phyllogigas, and one larger 

 plant (60 cm long), intact and broad-leaved, attached to a small stone, with strong 

 flattened hapteres forming a large holdfast. 



Already in small leaflets, with a length of a few mm, the strictly apical growth has 

 become suspended and there is no trace of a top-cell. Only by searching the almost micro- 

 scopic proliferations arising in tufts on the old stipe and midrib the active top-cell was 

 found. The youngest stages resemble Polycoryne: the lamina starts as a monosiphonous 

 filament, the cells soon cutting off pericentral cells. The semiterete body thus formed 

 is the stipe; the tip expands to a lamina, where, at first, a top-cell may be traced (fig. 

 19 a). The divisions do not follow the Delesseria-type, but perhaps Phycodrys or rather 

 Nitophyllum Gmelini as figured by Nienburg 1. c. p. 190, but top-cell action soon ceases, 

 and intercalary and diffuse marginal divisions become responsible for the enlargement 

 of the frond (fig. 19 b). As the formation of cortex is extremely rapid (the greater part 

 of the small lamina in 19 a is already corticated), it is very difficult to trace the cell 

 connections and analyze the growth. 



In Phyc. gener. t. 65 II Kutzing has given good figures of the anatomy in N. Bin- 

 derianum, the type species, showing the difference between Neuroglossum and Nito- 

 phyllum. In a polystromatic lamina of the latter the cells are isomorphous. Neuro- 

 glossum has a much thicker cortex than any Nitophyllum that I know — it should be 

 noted that we are speaking of the lamina, not of the stipe and costa — and there is a 



