1904] CURRENT LITERATURE 471 
THE TWENTIETH part of ENGLER’s Das Pflanzenreich is a presentation of the 
great tropical family Zingiberaceae by ScHUMANN.'3 The usual critical discus- 
sion of the family from various standpoints is followed by a presentation of the 
38 genera and 84 cies. Four new genera (Odontychium, Gagnepainia, 
Ajramomum, Noe and 141 new species are described.—J. M. C. 
Rotn’s Europdischen Laubmoose*4 progresses rapidly, the eighth part having 
been issued in July and the ninth in October. They contain the conclusion of 
the Acrocarpae and a good share of the Pleurocarpae. It would seem that two 
more parts might complete the work. The author would do well to devote a 
final part to keys to genera and species.—C. R. B 
THE SECOND fascicle of the third volume of HatAcsy’s's flora of Greece com- 
pletes the work, including from Gramineae through the pteridophytes. With 
this last fascicle appear the general preface, the bibliography, an introduction 
describing the floristic regions, and a good index.— A BF 
NOTES FOR STUDENES. 
BessEy'® has described the peculiar stomata of Holacantha Emoryi, a leafless 
shrub of the southwestern arid regions. The guard cells lie at the bottom of a 
narrow chimney-shaped cavity which extends above and below the epidermis, 
and consists of about eight vertical rows of cells—J. M. C. 
THE MoRPHOLOGY and general histology of three Pacific coast algae are 
described in the last number of the Minnesota Botanical Studies: ‘7 Callymenia 
‘phyllophora by Ciara K. Leavitt; Endocladia muricata by FLorence M. 
Warner; and Laminaria bullata by OLGA MuELLER.—B. M. Davis. 
Russeti'® shows many photographic prints produced by contact or mere 
approximation of various woods with a sensitized plate in darkness. The amount 
of action varies greatly with different woods, exposures of thirty minutes to eighteen 
hours or more being required. The active agent seems to be H,O,, and probably 
the resin in the wood is the indirect cause.—C. R. B. 
at 4 NN. 
13 ENGLER, A., Das Pflanzenreich. Heft 20. Zingiberaceae von K. ScHUMA 
pp. 458. Leipzig: Wilhelm Engelmann. 1904. 
hen Laubmoose. 
“+ Rome, Gnone, ts eee Leipzig: Wilhelm Engelmann. 
Leiferung 8, pp. 257-384. 
pls. 21-30. ee 9, pp- 385-512. pls. 31-40. 
1904. Each M 4. Not sold separately. 
1s HarAcsy, E. de, Conspectus Florae Graecae. Vol. III. fasc. 2. pp. 321-520. 
Leipzig: Withee Engelmann. 1904. 
16 BessEy, CHARLES E., The Saha stomat 
Bull. Torr. Bot. Club 31:523-527- pl. 24- 1904 
17 Minnesota Botanical Studies 3:291-308- pls. 44-47- 1904. aoe 
18 RUSSELL, W. J., On the action of wood on a photographic plate in the dark. 
Phil. sca oe. Soc. London B. 197:281-289- pls. 11-18. 1994 
a of Holacantha Emoryi. 
