112 THE JOURNAL OF BOTANY 
1892. C. Warnstorf. Hinige neue exotische Sphagna (Hedwigia 
1892, No. 4). 
1898. ©. Warnstorf. Beitriige zur Kenntniss exotischer Sphagna 
it 1898, 3, No. 
stort. Characteristik und Uebersicht der europiis- 
Sake Portmado ose nach dem heutigen Standpunkte der 
Sphagnologie (1893) (Schrift. d. naturw. Vereins d. Harzes 
in Wernigerode, viii. 1893). 
1894. E. Russow. Zur Kenntniss der Subsecundum- und Cymbi- 
folium-gruppe sine piiéebet Torfmoose (Archiv fiir die 
Naturk. Liv.- a nd Kurlands. Zweite Serie, Bd. x. 
Lfg. 4, pp. 861-527). 
eee, Warnstorf. S00 or pslentdaan und 1 ae der nord-, 
mittel-, und sudamerikanischen Torfmo nach dem 
heutigen Saclpeans der Sphagnologie (1898) (Hed- 
wigia, 1894, p. 807). 
1896. C. Warnstorf. Die Moos-vegetation der Tucheler Heide, mit 
besonderer Beriicksichtigung der Moose (Se riften d. 
Naturf. Ges. in Danzig. N. F., Bd. ix. heft 2, 1 896). 
1897. J. Cardot- Répertoire Sphagnologique (Bull, de la Soc. 
qd’ Histoire Migutclle ava ys 
1898. C. Warnstorf. Beitrige sone und europiischer Torf- 
moose (Bot. Centralbl. Ixxvi. p. 385 & 417). 
. Warnstorf. Neue Beitrige zur Kryptogamenfiora der 
Mark Brandenburg (Verhandl. d. Bot. Vereins d. Provinz 
Brandenburg, xli.). 
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Very abana varieties and forms have also been published in 
the two Sphagnum Exsicecata issued by easly The first of 
these, under a3 title of ‘* Sphagnotheca Europea,” contained Hs 
hundred numbers, and was issued in four fescinlcs of fifty; and 
the second, ‘ Sammlungen Europiischen Torfmoose,” containing 
four hundred numbers, was issued in four series in the years 1888, 
1890, 1892, and 1894 respectively. 
The main difference between Warnstorf’s system and that in 
general use in this country is due to the great importance ascribed 
in he former (1) to the position and form of the chlorophyllose 
cells in transections of the branch leaves :. and (2) to the 
form a distribution of the pores on the walls of the hyaline cells 
of the branch leayes and, to a less extent, of the stem leaves. To 
make out the former point, it is absolutely necessary to make 
transverse sections of the leaves. To do this it has been suggested 
which is then allowed ry; the sections are then cut with a 
zor, and on being placed in water the gum dissolves, and the 
sections can rm examined. is, however, is a somewhat lengthy 
process, and perfectly thin sections can be prepared with very little 
trouble by placing several branches together between the two split 
halves M3 a piece of elder-pith, and then cutting across the whole.. 
Care must be taken to select only the spreading branches, and the 
most highly developed leaves from the middle and lower portion of 
