( 80 ) 



and firmly adhering to the paper. Colour, a fine clear transparent 

 rosy pink. Favellidia, generally abundant in the form of small red 

 dots scattered among the vertical filaments, and consisting of a mass of 

 minute spores. Tetraspores we have not seen. 



This is one of the most beautiful as well as one of the most interesting 

 of our marine Algse, and no less so on paper than under the microscope. 

 Its soft, mellow, transparent colour, and light delicate branching render 

 it a very pretty object on paper, and the structure is so loose, every 

 filament standing so distinct and wide apart from its neighbour, that 

 when placed under the microscope its structure may be best understood 

 by comparing it to a minute microscopic Callithamnion, growing in a 

 small tube of sea-water which had suddenly congealed around it. When 

 the surface is placed under the microscope, nothing is seen but the 

 terminal cells of the vertical filaments, which look like so many Argus 

 eyes set in crystal. A living plant, in full fruit, placed in a vial of 

 sea- water, is a beaiitifid object. The rich transparency of the stems 

 and branches enables every little globule of fruit to be distinctly seen, 

 even by the naked eye, they appear like apples of ruby on a tree of 

 carnelian. 



The plant does not seem to be abundant anywhere, but has been 

 found all roimd our coasts in small quantities, and its appearance also, 

 like many other land and sea plants, is said to be uncertain. 



On the east and west coasts of Scotland we have gathered it fre- 

 quently, generally in clear shallow tide-pools, near low-water mark, 

 though occasionally within the margin of deej) pools near the surface, 

 always in places exposed to the sun, the specimens generally rather 

 small, but fruiting abundantly. 



We have seen some straggling form of Chylocladia clavellosa somewhat 

 resembling it, but the structure is so different that the least examina- 

 tion will at once decide the species. It has a much nearer affinity to 

 Dudresnaia divaricata, but from that the fistulose stem will readily 

 distinguish it. 



The structure and lubricity is also very much the same as that of the 

 Mesogloice among the Melanosperms, but from these the colour and 

 fructification remove it longo intervallo. 



EXPLANATION OF PLATE XCVIL 



Fig. 1. — Gloiosiphonia cai:>'dlaris, natural size. 

 2. — Branclilet with favellidia. 

 3. — Transverse section of a favellidium. 

 4. — Vertical filaments. 

 5, — Longitudinal filaments. All magnified. 



