Marine Flora of the Pacific Coast 

 of Rivularia and Calothrix species does not appear 

 to equal that of the New England coast. 



The marine Chlorophyceae, or grass-green algae, 

 of the western coast of North America present few 

 conspicuous species of special interest. The Ulvas 

 and Enteromorphas are abundant, and Ulva fasciata 

 is represented by a number of curiously unlike 

 forms. There are comparatively few species of 

 Cladophora, but C. trichotoma is common, forming 

 green spongy masses on exposed rocks from Van- 

 couver Island to Mexico. Spongomorpha arcta, Sp. 

 saxatilis and Sp. spinescens occur in the northern 

 portion of our range, while Sp. coalita is common 

 along the whole coast and is easily to be recognized 

 by its dark-green rope-like masses. Codium mucro- 

 natiim and C. adhaerans occur along the whole coast 

 and are easily to be recognized by their firm struc- 

 ture, the former being repeatedly dichotomous, the 

 latter forming a shapeless expansion. The curious 

 little Halicystis ovalis, with its green pear-shaped 

 fronds, one-half to one centimeter high, occurs on 

 crustaceous corallines on rocks near Monterey and 

 on Vancouver Island. 



The Phaeophyceae, or brown algae, of the west- 

 ern coast of North America are numerous and many 

 of them conspicuous and world-famed. The smaller 

 forms while abundant, and many of them peculiar 

 to the coast, present few species of very special 

 interest. The bladder-like Colpomenia sinuosa pre- 

 sents some curious forms. Soranthera ulvoidea, 

 another bladder-like form spotted with coarse 

 "fruiting-dots," the fir-like Chordaria ahietina, the 

 brain-like Leathesia difformis, and the prostrate 

 Cylindrocarpus berkeleyi may be mentioned for the 

 middle Californian coast, the last occurring also in 

 southern California. On the southern Californian 

 coast occur Endarachne binghamiae, a Phyllitis- 

 like plant, and Hapterophycus canaliculatus, a mem- 

 ber of the Ralfsiaceae with a branched thallus. 

 Several species of Coilodesme, a genus of elongated 

 tubular or bladdery species occur on Cystoseira or 

 Cystophyllum, or even (C. bulligera) on rocks. 



The chief glory of the west ^coast marine flora 

 and of the Phaeophyceae, as well, are the kelps or 

 Laminariaceae. No coast in the world has such a 

 variety or can snow so many conspicuous forms. 

 The kelp flora is largely different for the different 

 temperature regions of the coast; but one species, 

 the long bladder kelp, Macrocystis pyrifera, ex- 

 tends its entire length, or at least, from Sitka, 

 Alaska, to Magdalena Bay in Lower California. This 

 kelp is very long, 100 feet or more in length, with 



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