XLI. OBSERVATIONS ON PTERYGOPHORA. 
Conway MacMItuian. 
Among the larger and less thoroughly studied kelps of the 
Pacific coast, Plerygophora californica Ruprecht has seemed 
worthy of some attention. <A fine series of specimens was se- 
cured during the summer of 1901 at the Minnesota Seaside Sta- 
tion on the west coast of Vancouver Island, and while all points 
in the anatomy and life-history cannot be elucidated from the 
material in hand, it has seemed best to present an account of 
such structural and developmental facts as have been observed. 
The name, Pterygophora californica, appears for the first 
time in botanical literature in Ruprecht’s Algen-Stamme,* in 
1848. In this work no description is given of the genus and 
species, Ruprecht contenting himself with the statement that 
the new genus is intermediate between Capea (Eck/lonia) and 
Alaria—a point of view which has been but slightly modified 
by later study—and that it will be elsewhere described. In 
this work, however, there is given some account of the anatomy 
of the stem and the characteristic annular structure seen in the 
cross section is mentioned in the following phrase: ‘* Alle 
(zuweilen bis 9) Ringe deutlich und gleich stark sind.” It is in 
this paper, also, that Ruprecht announces the presence of muci- 
lage ducts in Plerygophora, an observation which has since 
been questioned by Areschoug. 
The formal description of Pterygophora californica, together 
with a plate which leaves something to be desired, is presented 
by Ruprecht in his ‘* PAlanzen aus dem nérdlichen Theile des 
Stillen Oceans,” ¢ published four years later. The specimens 
upon which the déscription of Ruprecht was based were col- 
* Ruprecht, F. J. Bemerkungen ueber den Bau und das Wachsthvm einiger 
grossen Algen-Stamme. Mem. Acad. Imp. Sci. Nat. Petersb. 6: 64, 70. 1848. 
+ Ruprecht, F. J. Neue oder umvollstandig bekannte Pflanzen aus dem 
nOrdlichen Theile des Stillen Oceans. Mem. Acad. Imp. Sci. Nat. Petersb. 7: 
17-19 (73-75)- 4. 5, 8 1852. 
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