REPORT ON THE BOTANY OF THE ATLANTIC ISLANDS. 5 



Nitophyllum acrospermum, J. G. Agardh. 



Nitophyllum acrospermum, J. G. Agardh, Sp. Alg., ii. p. 655 ; Dickie in Journ. Linn. Soc. Lond., 

 xiv. p. 357. 



St Paul's Rocks. Moseley. 



" The specimens few and not well preserved ; but on some the tetraspores form a 

 solitary circular patch near the apex of the frond, and in other respects agree with the 

 general characters of the species." — Dickie. 



Cape of Good Hope. 



Squamarie^e. 

 Hildenbrandtia expansa, n. sp. 



Hildenbrandtia expansa, n. sp., Dickie in Journ. Linn. Soc. Lond., xiv. p. 357. 



Incrustans, vage expansa, ferrugineo-sanguinea ; cellulse superficiales radiatim dispositse, 

 sphaerosporis irregulariter divisis. 



The cells of the surface have a distinctly radiate arrangement, are equal in length 

 and breadth, in diameter = 0'0002 to - 0004 of an inch. The plant is stated by Mr 

 Moseley to form a dull red band on rocks above the white band of Lithothamnion. 

 Its nearest ally seems to be Hildenbrandtia rosea, Kiitz., which occurs on the Atlantic 

 shores of Europe. 



St Paul's Rocks. Moseley. 



Only known from these rocks. 



Ceramiace^e. 

 Callithamnion ? 



Callithamnion f t 



St Paul's Rocks. Moseley. 



" In small quantity, forming a slender fringe about two lines long upon a few plants 

 of the Chnoospora ; no fruit, and altogether too imperfect for recognition ; it seems, 

 however, nearly allied to Callithamnion jpygmoBwm, Ktitz." — Dickie. 



CHLOROSPERME^E. 



Siphonace^;. 

 Caulerpa webbiana, Mont. 



Caulerpa webbiana, Mont., Phytogr. Canar., p. 178, t. 9, et Syll. Gen. et Sp. Crypt., p. 453; Dickie 



in Journ. Linn. Soc. Lond., xiv. p. 358. 

 Chauvinia webbiana, Kiitz., Sp. Alg., p. 499. 



St Paul's Rocks. Moseley. 

 Canary Islands ; Fernando-Noronha. 



