'.'[ SYXOrSIS OF BRITISH SI-.AWEED3. 



150. verrucata ( Tim to tlim, expanded, irregu- 



larly Lobed, pallid, dotted, over with innumerable, small, 

 pimply ceramidia. ffarv. Pin/. Brit. pi. 349 ', e. 

 PI. XXXVI. Fig. 166.) 



Hab. With tin 1 preceding. 



Patches from a quarter to half an inch in length, oblong, 

 variously lobed at the margin, uneven. Ceramidia very 

 numerous, minute. 



160. pustulata (T lie pimpled Jlelolema) ; thick, dull purple or 

 given, oblong or lobed, incrusting, smooth ; ceramidia 

 numerous, large, rat her prominent, conical, Lamour. Cor. 

 Flex. pi. 12. f. 2, a, 13. (Atlas, PL XXXVI. Fig. 166.) 



Hab. On Phyllophora rubens and other Algae. Common. 



Patches often an inch or more in length, and half an 

 inch broad, thickish, of irregular form, frequently lobed, 

 closely adhering to flat surfaces or clasping cylindrical 

 stems, the surface more or less uneven. Ceramidia several 

 on each patch, clustered, of large size in proportion to 

 those of other allied species, prominent, conical. Colour, 

 when well grown, a dark reddish-purple, changing to 

 green, and finally to white. I have thought it best to 

 figure this and the three preceding reputed species on one 

 plate, that the slight differences noticed between them 

 may be seen. 



XLIX. HILDEXBRAXDTIA. 



161. rubra (The red Hitti,e?ibrandtia) ; frond cartilagineo-rnem- 

 branaceous (not stony), crustaceous, suborbicular, adhering 

 by its lower surface, composed of very slender, closely 

 packed, vertical filaments ; conceptacles immersed in the 

 frond, orbicular, depressed, pierced by a hole, and contain- 

 ing tetraspores and paraphyses at the base of the cavity, 

 Meneq. Mem. Riun. Nat. Padov. 1811, p. 10. (Atlas, 

 PI. XXXV. Fig. 161.) 



Hildenbrandtia ]Sardi, Zanard. Ehododermis Drummondii, 



Haw. 

 Hab. On smooth stones and pebbles, between tide-marks, as 



well a? in deep water. At all seasons ? 

 The affinity of this obscure plant is rather doubtful, and 

 I am by no means satisfied with the position which I have 

 now assigned to it, next the ^ullipores. It differs from 

 those vegetables in wanting the lime which forms so re- 

 markable a portion of their solid contents ; but its cellular 

 structure is not very unlike that of a Nullipore, and there 



