- 48 - 
it appears that Warnstcrf had garbled his statements as to the specimen making 
up his S. Faxonii. In spite of this he retains them in 1911 12 with the further 
addition of the locality suggested by Bartlett. There is nothing either in the 
description or in such specimens as are available to separate it specifically from 
S. cuspidatum. 
The species is hardly as widely distributed as 5 . recurvum. On our eastern 
coast it extends from Labrador 13 southward to Georgia (Florida according to 
Warnstorf). It seems to be entirely lacking inland and on our Pacific coast. 
It is well represented in Europe, also in Japan, and forms of it or closely related 
species occur in various parts of the southern hemisphere. 
Var. Torreyi (Sullivant) Braithwaite, 1875. Such is the form and date of 
the name as first applied varietally. The earlier species name was S. Torreyanum 
Sullivant, 1849. Whether it should be called a variety or species is a matter 
still open to discussion. There is such lack of good characters separating them 
and it is so possible to find material showing the transition from one form to 
the other that I am unable to see in them separate species, though I think the 
variety is abundantly deserving of taxonomic recognition as such. The most 
immediately apparent distinction lies in the decidedly greater size of the variety. 
With its robustness goes a greater breadth. of branch-leaf, the latter tending 
then to be somewhat undulate and sometimes showing good-sized pores on the 
ventral surface of the empty cells. The chlorophyll cells are also not so much 
exposed on the ventral surface of the leaf, in its lower part being normally tri- 
angular in section with apex just reaching the surface of leaf. In all these re- 
spects the plant lies nearer to S. recurvum , and one could sooner conceive of 
the variety than of the type as an aquatic form of the latter species. Also the 
cortical cells of the stem are in the variety more irregular in size, with slightly 
thicker walls and forming a less definite cortical layer, but the condition is still 
too far removed from that of S. recurvum. Of synonyms Warnstorf has been 
guilty of one in S. Keameyi Warnstorf, 1900, from the Dismal Swamp of Vir- 
ginia, which marks at the same time the variety’s southern limit of range. 14 
From here northward the range is entirely coastal and extends to Newfound- 
land. In Europe it also shows coastal preferences, though Warnstorf (p. 233) 
gives a single locality from the Alps. It apparently does not occur elsewhere 15 
and compares then as to its range in a general way with S. pulchrum. 
Var. serrulatum Schliephacke, 1882 (first noted as S. laxifolium var. serru- 
latum, Schliephacke, 1865). To Sch’iephacke appears to belong the credit for 
having first taxonomically registered the fact that S. cuspidatum shows in its 
12 Op. cit. 231. 
13 Warnstorf (p. 266) includes it from Greenland, but his station is that of the variety Kruusei 
(not Krausei) Jensen, a fragment of which from Jensen’s herbarium is certainly referable to 5 . 
Lindbergii. 
14 It had been collected there before (1893) by Small and rightly named by Warnstorf. Car- 
dot’s S. cuspidatum var. miquelonen.se, 1887 has long since been reduced to synonymy. 
15 Warnstorf ’s locality in Tierra del Fuego requires confirmation. 
