78 BOTANICAL GAZETTE 
being a new genus.—F. V. CoviLLE (Proc. Wash. Acad. Sci. 3:56 
1901) has segregated two new genera from Cassiope, Harrimane/ia, conta 
C. stelleriana DC. and C. hypnoides D. Don, and Arcterica, containing C. 
coccoides Gray.— P. A, RYDBERG (Bull. Torr. Bot. Club 28: 605-643. 
has published a monograph of the American species of Limnorchis 
Piperia, both genera having been separated by him from Habenaria, i 
former genus 24 species being recognized (5 new), and in the latter 
new).— G. E. OsTERHOUT (tdem 644-645) has published new speci 
Linum, Mentzelia, Artemisia, and Agoseris from Colorado.—A. 
(Bot. Jahrb. 30: 289-445. pls 9-22. IgO1), in continuing his studies 
African collection of W. Goetze, has published, in addition to numer 
species, a new genus (Stenadenium Pax) of Euphorbiaceae.— RUDOLF 
NER ((Esterr. Bot. Zeitsch 51: 465. Igor) has described a new genus 
chlaena) of grasses from Madagascar, of the tribe Arundinelleae. 
: THomas” has made a comparative and experimental study 
_Tanean leaves or scales. They correspond morphologically to 
oles, or leaf blades, and in all cases differ widely from their m 
homologues. This divergence is particularly great where scales 
to leaf blades, the palisades, lacunae, bundles, mechanical cells, 
-Germal cuticle being much reduced or absent. When aerial b 
made to grow in the soil, leaf primordia develop into struct 
Geoeny te Uke thal of scales: leaf blades are reduced, petiol 
reduced, or sometimes even greatly enlarged as in Trifolium, 
etnies change to flat organs, collenchyma and bundles are 
bases, tian in normal leaves, stomata are entirely lost, palisad 
e foods are stored in abundance. 
Piers aca. te et 
a ches are made to grow in the air, scale primordia 
leaves, stomata appear, palisades, vascular tissues, and air spaces 
ey Merete ! 
_ 4, Some very interesting conclusions are drawn by the author, 
{8 found to be the morphological equivalent of the leaf part ne 
foe Pinde 8 POINNE Weal, the petiole or sheath in a pet 
‘Changes observed are quite different from the effects of mere 
__&e they to be attributed to arrested development, since they 
ioe... 
