— 64 — 
timately associated with Sphagnum fuscum ■ and 5 . subbicolor Hampe, or the form 
that has gone under that name among sphagnologists. The felty coat of the 
stems of the Polytrichum bound them as closely to those of the Sphagna when 
in contact as to each other. They were so much united that a pair of tweezers 
was found the best means of separating the different kinds when taken in the 
hand for study. The altitude of this swamp is doubtless below 600 feet, to judge 
by that of stations on the West Shore railroad. This runs upon the higher ground 
along the margin of the swamp that skirts it like the rim of a basin on the south 
side, the level of the swamp being several feet lower. The altitudes of stations 
of this railroad nearest the swamp east and west are respectively 579 feet and 604 
feet. 
It is of interest to add in this connection that Warnstorf, 1 when giving the 
habitat of Sphagnum fuscum for the province of Brandenburg, Prussia, as chiefly 
highmoors of alder and pine, states that it is commonly associated with Poly- 
trichum strictum and Sphagnum rubellum Wils. The latter was found in com- 
parative abundance in Bergen swamp, and in four of these of Lake County, 
Illinois, including that of Long Lake. This coincidence in association is a little 
striking and ecologically instructive, and may be looked on as more than casual 
among mosses of so wide a distribution. They are all of a boreal range, coming 
southward where conditions nearest the boreal are presented in our flora. The 
southernmost station for Sphagnum fuscum, S. rubellum , (and I may add for one 
of similar range 5 . Warnstorf ii Russ.) as far as I have met with them in Illinois, 
is a tamarack swamp near Bang’s Lake, at Wanconda, Lake County, about ten 
miles south of the station near Long Lake. As there are no more of these swamps 
till some in the dune region at the south end of Lake Michigan, in Lake and 
Porter Counties in Indiana are reached, the swamp at Wanconda may be taken 
as the southern limit, as far as now known, for these species in Illinois. Roll 2 
who collected mosses in the dune region of Indiana in 1888 reports one of them, 
5 . fuscum var. filiforme Roll (new var.) as found at Lake Station (now East 
Gary) Lake County, Ind. Though quite familiar with this region I have not 
yet come across it if it still persists among the changes that have gone on so 
rapidly in this locality. 
Chicago, Illinois. 
EXCHANGE DEPARTMENT 
Offerings — To Members Only, for Stamped Self-Addressed Envelope. 
Dr. John W. Bailey. 4541 14 th Ave., N. E., Seattle, Washington. — Bar- 
tramiopsis Lescurii (James) Kindb., collected by Prof. T. C. Frye in Alaska. 
Mr. George L. Kirk, 39 South Main St., Rutland, Vermont. — Diploschistes 
scruposus (L.) Norm., collected in Vermont. 
Dr. H. E. Hasse, Santa Monica, California. —Lecidea parasema Ach. var. 
achrista (Sommerf.), from California. 
1 Kryptogamenflora der Mark Brandenburg, 1: 431. 1903. 
2 Nordamerikanische Laubmoose, Torfraoose und Lebermoose, Hedwigia 33 : 295. 1893. 
