110 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Appendix IV. 



AKTIFICIAL KEY to the GENEEA of MAKINE 

 ALG^ found within the L.M.B.C. District. 



(Adapted byMr.E. A. L. Batters, E.L.S., from the Artificial 

 Key appended to Prof. Farlow's New England Algm). 



Note. — "As far as possible the characters used are those 

 which can be seen by the naked eye, but in many cases 

 the generic distinctions absolutely depend on microscopic 

 characters. It should, of course, be understood that the 

 key is entirely artificial and does not represent the true 

 botanical relations of our genera." Moreover, in many 

 cases the characters given refer only to the species found 

 in the L.M.B.C. District. 



1. Colour bluish or purplish green*; Algae of small 



size, usually more or less gelatinous 



(Cyanophyce.^) 5 



2. Colour grass green (CHLOROPHYCEiE) 14 



8. Colour from yellowish brown to olive green or 



nearly black (Ph^ophyce^) 25 



4. Colour red or reddish purple, rarely blackish, in 



fading becoming at times greenish 



(EhodophycExE) 5G 



5. Cells arranged in filaments 7 



Cells in colonies, but not forming filaments ... G 



6. Cells grouped in twos or multiples of two . . . Glmocapsa 

 Cells wedge-shaped or spherical, united into 



hemispherical or irregular colonies ... Dernwcarpa 



7. Filaments ending in a hyaline hair 18 



Filaments not ending in a hair 8 



* Glosjcapsa crcpidinum is an exception ; it is yellowish brown in colour. 



