¥ucece?\ halidrys. 107 



" Look wlio list thy gazeful eyes to feed 

 "With sight of that is fair ; look on the frame 

 Of this wyde universe, and therein read 

 The endless kinds of creatures which by name 

 Thou canst not count, much less their natm'e's aime, 

 AU which are made with wondrous wise respect, 

 And aU with admirable beauty deckt." 



^ Spensek : Hymn on Heavenly Beauty. 



Genus lY. PYCNOPHYCUS, Mtz, 



Gen, Char. Eoot composed of branching fibres, Frond cjdin- 

 drical, dichotomous. Air-vessels, when present, innate, simple. 

 Eeceptacles terminal, cellular, pierced by numerous pores, which 

 communicate with, immersed, spherical conceptacles, containing 

 in the lower part of the receptacles, parietal, simple spores, and 

 in the upper, tufted antheridia. — The name is from two Greek 

 words signifying tliick sea-tveed. — Harvey. 



1. Pycnophycus tuberculatus, Kutz, 



Hab. In rock-pools. Perennial. Summer and autumn. 



This is better known by the name of Fucus tuherculatus. 

 Those who have examined it see that it is very different in 

 many respects from Fucus proper. The generic name which 

 Kiitzing has given it, has reference to its structure,, being 

 compounded of two Greek words, the one signifying ildcTc^ 



