34 



active, divides up by radial walls and soon closes 

 round. 



Fucacece yield Acetic Acid when fermented at a 

 temperature of from 90 to 96 degrees Falirenheit, 



The epidermoid is in positive and the outer layer 

 of the cortex in negative tension, that is, the outer 

 layers are compressed by the inner layers, and the 

 latter stretched by the outer. 



EEPEODUCTION. 



The Anther idia (male) and Oogonia (female) are 

 formed in spherical hollows — conceptacles — which 

 make their appearance in large numbers at the ends 

 of the branches. Each conceptacle communicates 

 by a narrow channel — the osteole — with the sea water. 

 The layer of cells which clothes the hollow is a 

 continuation of the external epidermal layer of the 

 Thallus and since the filaments which produce the 

 Antheridia and Oogonia sprout from it, the latter are 

 morphologically trichomes (any outgrowth from the 

 epidermis, e.g., hairs, is called a trichome.) 



Some species are moncecious, i.e., both kinds of 

 sexual organs are developed in the same conceptacle, 

 as in Fucus platycarpus (this species is further charac- 

 terised by always being devoid of air-bladders) ; 

 others are dioecious, i.e., the conceptacles of one plant 

 containing only oogonia, those of another only 

 antheridia, as in F. vesiculosus. A number of hairs 

 which grow in the conceptacles among the sexual 



