THE AfARTXE ALQ^E OF OUERXSEY 11 



the rough erect stipes forms a conspicuous feature of the sub- 

 littoral. 



A few stunted specimens were found in pools at low tide. 



Sacchohiza polyschides Batt. (S. hulbosa De la Pyl.)- 



Alaria esculenta Grey. H. & B. 



Zanardinia collaris Crn. {Zonaria collaris Ag.). [N.W. 2.] 

 v.r. 



CuTLERiA MuryriFiDA Grev, [Lelievre]. 



Aglaozonia keptans Cm. {Zonaria ])cti'vula Grev.). [N.W. 2.] 

 W. 4. On Lith. 2)oJymorp1ium. 



FuciNE^. 



C.I. Fucus SPIRALIS L. {F. Arescliougiil^\e\\m.). c. — y^y. plafi/- 

 carpiis Batt. (jF". 'platy carpus Thur.). c. 



A definite zone of these algae grows round the whole of 

 Guernsey, interrupted only here and there by a sea-wall or by 

 the absence of rocks at a suitable level. It is incomprehensible 

 how ¥, spiralis can have been overlooked, as it occurs all 

 along the coast, broadening occasionally into var. platycarpus 

 according to the degree of shelter experienced. 



F. YESicuLOSUS L. c. — (c.i.) var. evesiculosus Auct. a. S.W. 

 W. 1. On exposed rocks. 



This is another plant which has escaped notice on the island. 

 It is a distinctive feature in the flora of exposed regions,, 

 where it takes the place of F. vesiculosus and Ascophyllum 

 oiodosuih of other localities. The plants are short and stout,. 

 about 4 inches in length, with thick leathery stems, firm and 

 devoid of air- vesicles, as the name indicates ; the colour is very 

 dark, almost black. 



F. SERRATUS L. c. On low rocks. 



Ascophyllum nodosum Le Jol. a. W. 1, 7. N.W, E. 6. 



Pelvetia cakaliculata Dene. & Thur. {F. canaliculatus L.). a, 



BiFURCARiA TUBERCULATA Stack, f. {Pyoiophycus tuber- 

 culatus Kiitz.). 



HiMANTHALiA LOREA Lyngb. La. 



Halidrys siliquosa Lyngb. La. 



Cystoseira ericoides Ag. La. N.W. 4, S,W. On stones-, 

 and in pools. 



C. granulata Ag. [N.W. 4. N. 2.] E. 2. On stones and im 

 pools. 



C. FIBROSA Ag. N.W. 4. On stones and in pools. 



C. DiscoRS Ag. {C.foeniculacea Grev.). [E, 2, 10. W. 7, 5. J 

 N.W. 4. 



TlLOPTERIDE^E. 



TiLOPTERis Mertensii Kutz. {Fct. Mertensii Harv.). H. & B. 



"02. 

 AcHiNETOSPORA PUSiLLA Born. {Fct. puslllus Harv.). [S. 2.] 



S. 5. — (c.i.) var. crinifa Batt. {Fct. crinitus Carm.). Ou 



U. latissima. E. 6, 



