THE MARINE AJjil,M OF GUERNSEY 9 



M. STELLlTLATA Batt. (Elackista stellulata Griff.). On 

 Bictyota. [E. 10.] E. 11. 



Elachtsta fucicola Fries. On small algie and Euci. N.W. 4. 

 N. 2. 



E. FLACCIDA Aresch. On Cy. granulosa and Cy. ilhrosa. 

 [N.W. 5. S. 2.] 



E. SCUTULATA Duby. [E. 10,2. N.W. 5.] S. 6. On Kim an- 

 thalia. 



SpHACELARiA RADICALS Harv. [N.W. 2.] 



S. OLiYACEA Pringsh. H. & B. '02. 



S. ciRRHOSA Ag. — var.joe;i7za^« Hauck. c. On Corallina offici- 

 nalis, etc, — (g.) var. fusca H. & B. {S. fusca Ha^v^), 

 E. 2, 7, 11. a. On vertical rocks. — (c.i.) y2^i\ pateniissima 

 Grev. r. Entangled among Enteromorplia clathrata and 

 on shell of spider crab. W. 1, 4. N.W. 7. 



I have followed Batters in placing the var. patentissima 

 tinder cirrJiosa. Sauvageau, however, questions this, and 

 points out that since neither propagulas nor spores have been 

 seen on the plant it might equally be allied to 8. 'plumula. 

 Specimens have also been found to possess transverse divisions 

 in the secondary articulations — a fact which would connect 

 those plants with 8. plumiyera. He therefore concludes that 

 the var. patentissima, usually attributed to cirrJiosa, is a form 

 which several species take when certain unknown conditions 

 have produced parallel modifications, such as that of sterility. 

 My own specimens have so much the appearance of S. plumula 

 that it is difficult to distinguish between them ; the resemblance 

 is much closer than to SpJiacelaria cirrJiosa. 

 C.I. S. PLUMULA Zan. {S. pseudo-plumosa Holm. Fac. no. 24), 

 Dredged, entangled among small algae and on F. serratus. 

 E. 8, 11. W. 4. 



The characters which separate this from 8. plumiyera and 

 CJicetopteris are the absence of transverse septa in the secondarv 

 articulations of the branches, and the scarcity of rhizoidal 

 filaments ; those that occur lie close to the axis of the plant,, 

 but do not form a cortex. It is an inhabitant of the 

 temperate zone in Europe, extending fi-om the Mediterranean 

 as far north as the southern shores of England. 



Cladostephus spoxgiosus Ag. c. E. 2. W. 4. On stones 

 in sand. 



C. YERTiciLLATUS Ag. c. E. 2. S. 6. W. 4. On stones in' 

 s^.nd. 



Halopteris filicina Kiitz. {8p>Ji.Jilicina Ag.). At low tide 

 all round the island, but scantily distributed. [S. 2, 3, 5,. 

 N.W. 2. N. 2.] E. 11. W. 1.— var. 8ertularia (Bonnem.) 

 {JI. jilicina Kiitz., B. patens Harv.). v.r. Entangled 

 among JEnt. clatJirata. W. 5. N.W. 7. 



Stypocaulon scoparium Kiitz. {8pJiacelaria scoparia Ag,), 

 c. k\n(^n^ Zoster a. — (c.i.) Md,Y. scoparioides^. \^. {8ph^ 

 scoparioides Ag.). r. Entangled among Ent, clatJirata. 

 N.W. 7. 



