MACROCYSTIS 65 
pyrifera from the western coast of North America and about the 
same also as the first type figured by Skottsberg* for the same 
species from South Georgia. 
These basal sporophyls bear numerous long (2-5 mm.) flexible 
filiform teeth, very different from the short rigid teeth of the 
sporophyls of M. integrifolia. 
Dr. Coker's 09635, which was evidently a detached floating 
fragment, is of especial interest for the reason that its nine blades 
are all fertile, seven of these nine having the ordinary vegetative 
form with normal pyriform or subglobose air-vesicles (PLATE 24). 
The two blades that lack individual vesicles (see photograph) 
stand nearly opposite each other at one end of the floating stipe 
or stem, which is somewhat enlarged and bladder-like at this point. 
This was evidently the distal or apical end of a segment of the 
plant that was broken off both proximally and distally and it 
seems probable that the two blades without proper vesicles were 
formed by regenerationf from this broken-off apical end. Parts 
of five of the nine leaves of this fragment are shown in PLATE 24. 
Тһе sori occur on one ог both surfaces and mostly in the basal half 
of the blade and usually take the form of oblong, suborbicular 
or very irregular brownish blotches 2-5 mm. in diameter, which 
remain isolated and separate in the upper and marginal portions 
of the fertile areas, but become confluent in the basal and median 
portions; in some of the blades, however, the sorus is continuous, 
but in these cases is confined to the extreme base of the blade. 
The surface of the blades is smooth or very lightly wrinkled, as in 
all the Peruvian forms of Macrocystis that we have seen, and we 
have, accordingly, observed no approach to any limitation of sori 
to the bottoms of grooves and furrows as described and figured by 
Smith and Whittingi and by Skottsberg.§ Setchell and Gardner|| 
have referred to Peruvian specimens in which sori occur " on leaves 
near the tip and provided with bladders" and what are pre- 
sumably the same specimens have been referred to again by Edna 
Un WURDE ae а 
ж Schwed. Sudpol.-Exp. 4°: f. 123. 1907. : 
+ Compare: Setchell, W. A. Regeneration among kelps. Univ. California Publ. 
. 1905. 
Phyc. Mem. 85. #1. 20. f. 1, 2. 1895. 
$ Loc. cit. 105. f. 125, 126. 
| Univ. California Publ. Bot. 1: 270. 1903. 
