Ceramiea.} microcladia. 203 



variable plants and some of the varieties are beautiful. The 

 finest I have seen were found by Major Martin at Ardrossan, 

 and by Mr. Keddie at Oban and lona. It has been found 

 by Mrs. Gatty at Filey; by Miss Allardyce at Cromarty; 

 and by Mrs. Tyers at Bristol. 



Genus XLII. MICROCLADIA, Greville. 

 Gen. Char. Frond filiform, compressed, distichously branched, 

 traversed by a wide, articulated tube, surrounded by large, 

 coloured, angular, radiating cells ; external coat formed of 

 minute reticulated cellules. Fructification of two kinds, on dis- 

 tinct individuals : 1, tetraspores immersed in the ramuli ; 2, 

 sessile, roundish receptacles (favellse), having a pellucid limbus, 

 containing numerous minute angular spores, and surrounded by 

 several short simple involucral ramuli. — The name is from two 

 Greek words, signifying a small branch. — Harvey. 



1. Microcladia GLANDULOSA, (rfei?. (PlateYIIL, fig.32, 

 portion of the frond, natural size ; figure on the left, branch- 

 let with favella, magnified.) 



Hab. On rocks, and on Algse, at low water. Annual. 

 Summer. Very rare. Mrs. Griffiths, Torquay ; Miss Warren, 

 Talmouth; Mr. Ealfs, Teignmouth; and specimens larger 

 than usual, being 2j inches long, have lately been found by 



