14 THE MAEINE ALGJE OF GUERNSEY 



scentibus, 4-9 mm. long. Filiis sparse et vage ramosis, e 

 articulis 45-60 /x long., 15-20 /x, lat. compositis ; ramis obtusis 

 fastigiatis versus ad apices eormn ramos breves secundarios 

 gerentibus ; ramis secundariis 2-3 ramulos adaxiales pleurumque 

 monosporangif eros 2-3 cell, longos emittentibus ; mono- 

 sporangies adaxialiter obvenientibus, ovatis, pedicellatis aut 

 sessilibus, 30-35 /x x 15-20 fx. 



A luxuriant growth of this species was found on the stipes 

 of Sacchoriza polyschides in October and November of 1912 

 and 1914, in an exposed region. The plant is assigned to the 

 genus Chantrcinsia on account of the monosporous repro- 

 duction and the basal disc of fusing rhizoidal filaments ; it 

 closely approaches Daviesii, but differs in the lax disposition 

 of the sporangiferous branchlets which are situated towards 

 the summits of the main branches, whereas in C. Daviesii 

 the sporangiferous branches are longer, more numerous and 

 crowded in or near the axils of the secondare" branchlets on 

 any part of the filament. The species is much more robust 

 than G. Daviesii and possesses quite remarkably thick cell- 

 walls. The absence of the terminal hairs is unimportant; 

 Rosevinge points out that they are not of constant occurrence ; 

 some species never bear them and some only in their early 

 stages. 

 G. Nemaliox elminthoides Batt. N. 2. N.W. 2. E. 3. On 

 exposed rocks. 



This is found at L'Ancresse on bare rocks dashed over by 

 the waves at low tide. Yendo refers to this genus as one 

 flourishing best where aeration of the water is perfect, /. e. 

 when surrounded by white foam. 



Helminthocladia purpurea J. Ag. {Nemalion jpurpureum 

 Chauv.). [S. 3, 5], and floating. 



Helminthora dtvaricata J. Ag. {Dudresnaya divaricata 

 Harv.). [S. 4, 5. E. 4.] N.W. 2, 3. N. 1. On other 

 algse. 



SciNAiA FURCELLATA Bivoua. (^Giiinauia fuvceUata Mont.). 

 [N. 2. S. 2.].— (c.i.) f. suhcostata J. Ag. Dredged off 

 E. 11. 



Choreocolax polysiphoni^ Reinsch. Mrs. Humber, 1902, on 

 Poly, fast if/iata; also N.W. 3, 4. 

 C.I. C. TUMiDUS Reinsch. On Cer. riihrum. r. E. 6. N.W. 4. 



NACCARiAWiGGHiiEndl. [W.4.] N.W. 2,4. N. 1. Floating. 



Pterocladia capillacea Born ( Gelidum corneum vars. e capil- 

 laceum, ciinifonne, et y pinnatum Grev.). [E. 4.] S. 5. 

 W. 3, 4. E.'2, 6. On rocks. 

 G. Gelidum crinale J. Ag. (^G. corneum var. crinale Auct.). 



E. 6. 

 G. G. PUSiLLUM Le Jol. ((t. corneum var. clavatum Grev.), et var. 



ccespitosum J. Ag.). W. 1. On rocks. 

 C.I. G. ACULEATUM Batt. {G. corneum var. acideatum Grev.). 

 W. 1, 4. E. 5, 7. On rocks. — (c.i.) var. ahnorme Batt. 

 (G. corneum var. ahnorme Grev.). E. 7. 



