UNIVERSITY or CALIFORNIA PUBLICATIONS 



•i 



BOTANY 



V, ^ '0 6, pp. 153-164, pU. J7 :^ Is..-:! Yj;/ 7, 1915 



.XOTKS 0\ PACIirlC COAST ALGAE 

 T. PVLA//:LLA PO.^T/CL.-fAEy, SR, A XEW UB 



TVPi-: iX TJfK GEXU.S PYLMKLLA 



CABL SKOTTSBEBG 



111 a pap^T fmtitled "Xew and littk-known brown a%ae of the 

 Pacific Coa»t/' published in Erythea, VoL VII (1899). De Atton 

 Sannders has reported Leptonema famcicukttum Reinke from the coast 

 of California. When collecting with Professor W, A- Setchell around 

 FaraUon and Monterey Bay in 1913 I foand nnmerons small brown 

 tnfts on Fodehia. and Professor Setchell informed me that this was 

 the plant called Leptonema fmcieulatum by Saunders. Being familiar 

 with that species, whose occurrence on the Calif omian coast was rather 

 snrprising. I at once locJced at some fresh material and found that, 

 although it brjire a certain resemblance to Leptonema, there were im- 

 p^^rtant points of difference. After my return to Sweden I under- 

 took a more careful investigation, the result of which is published here, 



The alga in question forms dark brown tufts 5-10 mm. long on 

 the stems and leaves of Fosstehia palmaeformk Rupr. I have not 

 seen it on other algae nor on a dead substratum. Saunders «aj-s that, 

 occasionally, it grows also on mu.ssel-shells in the vicinity of Fogiehia. 

 I have no right to doubt the correctne^ of this statement, but at the 

 same time it has to be confirmed by a critical examination, for every- 

 body knows that many of the tiny brown algae look alike on a super- 

 ficial glance. 



Several semi-endophj-tic species are reported to be confined to one 

 special host plant. We are far from understanding why they .should 

 be so exclusive in their choice of habitat, as they are not true parasites. 



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