262 BOTANICAL GAZETTE [MARCH 
Vegetative reproduction in Selaginella.—Miss Bancrorr® has investi- 
gated the reproductive “tubers” of two species of Selaginella from India. 
In S. chrysocaulos there occur budlike structures at the tips of some of the 
vegetative branches; while in S. chrysorrhizos the stem apices forming the 
uds” repeatedly fork, rhizophores often occurring in the fork between two 
branches. Miss BANCROFT investigated the behavior of both these repro- 
ductive structures, which differs in details, since in one of the species the 
“tubers”? remain at the surface of the ground; while in the other they are 
developed underground, at the ends of filamentous vegetative branches.— 
eS OE ee 
Anatomy of some xerophilous ferns.—Marsn” has made an anatomical 
study of certain xerophilous species of Cheilanthes and Pellaea, material having 
been obtained chiefly from the United States. Such well marked leaf ‘‘adapta- 
tions” as hairs or scales on the lower surface, inrolled margins, thick cuticle, 
and palisade parenchyma are described. e xylem features are discussed 
in detail, and one of the interesting conclusions is that “the petiolar structure, 
the stem anatomy, and the greater output of spores per sporangium, all point 
to Cheilanthes Fendleri as a near approximation to an ancestral type, from 
which C, gracillima and C. lanuginosa have been derived.” —J. M. C. 
Sphagnum bogs of Alaska.—Ricc"® has noted the peculiarities of the 
flora of some Alaskan peat bogs and finds that while sphagnum occurs in many 
different habitats in Alaska, only where there is an absence of drainage do 
bogs accompany it. The peat in the bogs visited had a maximum depth of 
only 2.5 ft. Aside from the sphagnum, Empetrum nigrum is the most abun- 
dant and uniform in its occurrence, but Ledum palustre, Kalmia glauca, Oxy- 
coccus cy Aiet and Drosea rotundifolia are among other characteristic 
species. e bogs occur surrounded by treeless areas, by tundras, oF by 
sesh aoe and vary much in area.—Geo. D. FULLER. 
Ecological aspects of Paleozoic vegetation —DACHNOWSKI® has given an 
account of the probable vegetational features and ecological conditions of 
Ohio from Ordovician through Pennsylvanian time. e most important 
part of this paper is the discussion relative to the prevailing xeromorphy of 
Paleozoic land plants. It has long been known that most of these xeromorphic 
” Boca N., Note on vegetative oT in some Indian selaginellas. 
Ann. Botany 28:685-693. pl. 49. figs. 7. 1914 
7 Marsu, A. S., The anatomy of some secenllen species of Cheilanthes and 
Pellaea. han, Doty 28:671-084. figs. 11. 1914. 
Rico. Gu B. oe on the flora of some Alaskan sphagnum bogs. Plant 
World 17: enews: 19 
19 DACHNOWSKI, re - ancient vegetation of Ohio and its ecological conditions 
for growth. Ohio Naturalist 11:312-331. tox1; Amer. Jour. Sci. 32:33-39- 191! 
