566 University of California Publications in Botany [Vol. 8 



6. Desmarestia lignlata ( Light f.) Lamour. 



Plate 87 



Fronds plumose, up to 8 dm. high (in our territory), 6-8 mm. wide, 

 firmly attached by a relatively large disk; primary axis closely beset 

 with opposite, primary branches throughout, exceedingly variable in 

 size and complexity of branching, some of which extend beyond its 

 apex ; ramuli all opposite, closely crowded, of 4-5 orders, the ultimate 

 reduced to fine teeth or aculeae, all very decidedly flattened ; midrib 

 barely discernible in the primary axis and main laterals ; hairs very 

 abundant, with short, very acute, opposite branches, giving rise along 

 the margins of the ultimate branches to numerous small acute ramuli, 

 many of which disappear at maturity. 



Growing on rocks in the upper sublittoral and lower littoral belts 

 among and in the vicinity of the San Juan group of islands, 

 Washington. 



Lamouroux, Essai, 1813, p. 25 ; Harvey, Phyc. Brit., vol. 1, 1847, 

 pi. 115 ; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 247 ; Pease, 

 P.S.M.S. Publ., vol. 1, 1917, p. 388, and vol. 2, 1920, p. 314 ; Wyatt, Alg. 

 Danmon., no. 55 ; Le Jolis, Alg. mar. Cherb., no. 268 ; Hauck and 

 Richter, Phyk. Univ., no. 420. Fucus ligulatus Lightfoot, Flora Scotia, 

 vol. 2, 1777, p. 946, pi. 29. 



There may be still a question as to whether typical Desmarestia 

 ligulata occurs on our coast. Pease (1920, p. 316) has argued that it 

 does and we have adopted her opinion. There does occur on the island 

 of San Juan and apparently in abundance a narrow, branched plant 

 with short filiform stipe without prominent midvein, and lacking 

 lateral veins, which seems to correspond to Lightfoot 's figure of Fucus 

 ligulatus and description and with British plants. The type locality 

 is on the Scottish coast and is probably on the Firth of Forth. 



7. Desmarestia herbacea (Turner) Lamour. 



Plate 88 

 Fronds ligulate, 1.5-2.5 m. long, 1-2 cm. wide, the rhachis and 

 the primary branches with a distinct, conspicuous midrib ; stipe very 

 short, almost immediately flattened ; branches of 3-4 orders, each 

 order much reduced but exceedingly variable in size, the primary 

 branches often reaching the size of the rhachis, but interspersed with 

 branches only a few centimeters long ; all of the branches, though 



