1889.] Botany. 539 
Marchantia and Melastoma. The accompanying colored plate 
represents a twig bearing leaves, fruit and seed of Theobrouia 
cacao, the chocolate tree of full size. The fascicles contain 
about 80 pages, and are of quarto size. Among the collabor- 
ators are Dr. Seynes, Nylander, Dutailly, Weddell, Durand, 
besides many other specialists. 
LuERSSEN's Fteridophyta.— In 1884 the first part of 
Luerssen's work on the Pteridophytes of Germany appeared, 
and recently part 14, which completes the volume, has come 
to hand. The work constitutes Vol. III. of the new edition of 
Rabenhorst's Kryptogamen-Flora von Deutschland, Oester- 
reich und der Schweiz. The treatment of the subject is 
eminently satisfactory, the text being full, and the illustrations 
numerous and of fine quality. Some estimate may be made of 
the fulness of the work when the reader learns that for the 
eighty-eight species described, we have here a volume of no- 
less than 906 pages. 
Luerssen's system is as follows : 
CLASS I. FILICINAE Prantl. 
Snb-Class I. Isosporeae Sachs. 
Section I. LeptosporangiatJE, Goebel. 
Order I. Filices L. 
Sub-Order I. Hymenophyllaceae Bory. 
Family i. Hymenophylloideae Pr. 
Sub-Order I[. Polypodiaceae Martius. 
Family i. Polypodieae Meth. 
Family 2. Aspleniaceae Meth. 
Family 3. Aspidiaceae Meth. 
Sub-Order III. Osmundaceae Brongu. 
Family i. Osmundaceae Brongu. 
Section II. Eusporangiatae Goebel. 
Order II. Ophioglossaceae R. Br. 
Family i. Ophioglosseae R. Br. 
Sub-Class II. Heterosporeae Sachs. 
Order III. Hydropterides Willd. 
Family i . Salviniaceae Bartl. 
Family 2. Marsiliaceae Bartl. 
