60 LAMINARIACEAE 
fusion of species. Skottsberg* finds muciferous canals in both 
stipe and blade of the specimens that he refers to L. nigrescens, 
but J. Agardhf finds no "lacunae" in what he considers the true 
L. nigrescens. More copious material and a thorough examination 
of the types of Bory and other writers would be necessary for a 
wholly satisfactory disposition of Dr. Coker’s Peruvian Lessonias. 
. PLATE 17. Lessonia nigrescens 
Photograph of a specimen (from liquid preservative—Coker 09612), collected on 
rocks in surf, Chincha Islands; a little less than one sixth of the natural dimensions. 
Montagne (Voy. Bonite, Bot. Crypt. 38) attributed Lessonia 
fuscescens to Callao on the strength of a “specimen mancum 
foliisque orbatum legit cel. Gaudichaud.” 
Lessonia Suhrii J. Ag. (Linnaea 15: 4. 1841; Sp. АШ. 1: 150. 
1848), originally described from Chile, has been attributed to Peru 
by Grunow (Reise Novara Bot. т: 51. 1867). It is described by 
J. Agardh as having “folia 4-6 pollicaria, 2 lineas circiter lata." 
Nothing that seems to resemble it closely occurs in Dr. Coker's 
collections. 
MACROCYSTIS Ag. Sp. Аш. т: 46. 1820 
MACROCYSTIS INTEGRIFOLIA Bory, Dict. Class. Hist. Nat. 
10: 9. 1826. [As M. integrifolius] 
Macrocystis integrifrons a Bory, Voy. Coquille, Bot. Crypt. 87. 
1827; М. 6. f а. 1828. 
Macrocystis zosteraefolia Ag. Act. Acad. Caes. Leop.-Car. 19: 301. 
ph. 26.7. 13: 1835. 
Macrocystis angustifolia Aresch. Obs. Phyc. 4: 22. 1883. De- 
Toni, p.p. Syll. Alg. 3: 371. 1895. Not Macrocystis angusti- 
folius Bory, Dict. Class. Hist. Nat. то: 9. 1826 (as to the 
technical “type,” which was from New Holland.) 
On surf-washed rocks, Chincha Islands, June 12, 1907, Coker 
09600 (PLATES 20 and 21) and 09014 (PLATE 19); floating, Callao 
Bay, Feb. 26, 1907, Coker 00166 (PLATE 22). More or less of 
the material under all of these numbers is fertile. 
о Зи excellent specimens secured by Dr. Coker incline us to 
оа ТЕНИ Ў 
1 Anal. Alg. Cont. 2: 88. 1894. 
