1920 



Pease; on Desmarestia 



317 



thickening throughout almost the entire length of the main axis and the 

 larger branches and is visible to the unaided eye as a definite ridge on 

 the surface of branches of the third and fourth orders which are only a 

 C'^ntimeter long. In herbarium material it is much less evident. 



Reproduction has not been observed, but probably takes place as 

 Kuckuck (1894) and Rosenvinge (1894) have reported for D. aculeata, 

 and Skottsberg (1907) for D. firma. 



c. Desmarestia herbacea (Turner) Lamouroux 

 (Plate 54, Fig. 3; Plate 60, Figs. 1-4.) 



Fucus herbaceus Turner 



Mertens 



Desmarestia herbacea Lamouroux 

 Greville 

 Kiitzing 

 Griinow 

 Skottsberg 

 Pease 



Sporochmis herbaceus Agardh 

 Sprengel 

 Postels and 

 Ruprecht 

 Reinsch 



Desmia herbacea 



Hist. Fuc. 2:78. pi. 99. 



Linnaea. 4:62. 



Ess. 25. 



Alg. Brit. syn. 40 



Phyc. Gen. 343 



Novara 51 



Antarkt. Meeresalg. 23. 



P. S. M. S. Publ. 1:388. 



Syst. Alg. 261. 



Syst. Veg. 4:329 



Illust. Alg. 13. 

 Flora, n.r. 46:189. 



Desmarestia ligulata 

 var. herbacea 



Agardh,J. G. Sp.Gen.Ord.Alg. 1.2.1. 169. 



DeToni Syl. Alg. 3:460. 



Set. & Gard. U. Cal. Pub. Bot. 1 :247. 



C, H. & Set. P.B.-A. Fasc.D. 79 a. and 



1809 

 1829 

 1813 

 1830 

 1843 

 1867 

 1907 

 1917 

 1824 

 1827 



1840 



1888 



1848-51 



1895 



1903 



b. 1905 



This beautiful species, brought from the northwest coast of North 

 America by Menzies, was first published by Turner (1809) under the 

 name Fucus herbaceus, with the following description: "frond mem- 

 branacea, plana, obsolete costa, bipinnata ; segmentis oppositis, ellipticis, 

 base attcnuatis, apice obtusis; marginc spinoso dentatis." 



The writer can formulate no better description of the growth habit of 

 the plant than given by Turner, which is quoted in full. "Root, a small 

 callous disk. Frond flat, two feet or more long, rising with a single in- 

 dividual stem, at its base nearly cylindrical, and as thick as a crow's quill, 

 but almost immediately becoming flat, and gradually widening to the 

 height of a few inches, where it acquires a width of half an inch, or three 

 quarters of an inch, after which it continues linear till, on approaching the 

 extremity, it is again slightly narrowed and terminates in a rounded apex ; 



