1890.] Recent Literature. 53 
B. ISOGAMÆ. 
Fam. 14. Dasycladiacee (Endl.) Cramer. 
“ i5, Derbestacee Thur. 
“ 16. Bryopsidacee (Bory.) Thur. 
“ 17. Caulerpacee Reicheub. 
“ 18. Spongodiacee Lamour. 
‘* 19. Udoteacee (Endl.) J. Ag. 
Hydrogastraceea (Endl.) Rabeuh. 
1. Phyllosiphonacee Frank. 
Ord. I1I.—Protococcoidez, (Menegh.) Kirch. 
Fam. 22. Volvecacee (Cohn) Kirch. 
“ 23. Palmellacee (Decaine) Neg. em. 
Ord. IV.—Conjugatz (Link.) DeBary. 
Fam. 24. Zygnemacee (Menegh.) Rabeuh. 
“ 25. Desmidiacee (Kuetz.) DeBary. 
These families include two hundred and twenty-nine genera, and 
twenty-nine hundred and ninety-two (2992) species. Very many of 
the genera contain but a single species, there being no less than eighty- 
nine such, with many containing but two species. On the other hand, 
there are several large genera, e.g., CEdogonium, with 189 species ; 
Cladophora, with 229; Spirogyra, 84; Closterium, 103; Cosmarium, 
307; Euastrum, 99; Staurastrum, 250.—CHaRLEs E, BESSEY. 
Gremli’s Flora of Switzerland.?—This little volume is a genu- 
ine pocket manual,—a trifle large, perhaps, but still small enough to 
be readily slipped into the traveler’s coat pocket. It measures 434 by 7 
inches, and is less than an inch in thickness. The contrast between 
these measurements and those of our ordinary manuals is striking, e.g., 
Gray’s, 814 by 534 by 1% inches; Coulter’s, about the same; Chap- 
man’s, 834 by 534 by 114; Wood’s Classbook, 8% by 6% by 134 ; 
Wood’s Botanist and Florist, 8 by 51% by 1%. This contrast is still 
greater when we note the fact that this book contains descriptions of 
fully 2500 species, while Gray’s has but 2348, and Coulter’s 1881. 
The descriptions are brief, but apparently quite satisfactory, and 
much space is saved by the liberal use of abbreviations. Keys are 
abundantly provided, so that there need be no difficulty in determining 
the name and classification of any plant. 
In print, binding, and general appearance (including color), this 
2 The Flora of Switzerland, for the use of Tourists and Field-botanists, by A. Gremli. 
Translated from the fifth edition by Leonard W. Paitson, London. David Nutt, 270 
Strand, 1889. Printed at Zurich. 12mo, pp. xxiv., 454. 
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