256 BOTANICAL GAZETTE [MARCH 
The country is relatively poor in glacial relicts, a few being found in the more 
elevated limestone areas. There is but one endemic seed plant in the country, 
romus arduennensis. This work, like others by the same author, is profusely 
illustrated by remarkable photographs. It is not too much to say that 
Massart is the best of ecological photographers.—H. C. CowLes. 
The Lower Cretaceous flora 
A volume of the Maryland Geological Survey just issued (1911) contains 
what is perhaps the most complete systematic account, as yet, of the vascular 
flora of the Lower Cretaceous. The author, Eowarp W. Berry, has prepared 
what is in effect a “‘manual of botany” for the Lower Cretaceous. To traverse 
what may be regarded as the rubbish of descriptions from all sorts of “impres- 
sions,” and to obtain from it something of order, is an attempt that deserves 
commendation, however much opinion may vary as to the result. We have 
now before us, in convenient form (pp. 295) and illustrated by 76 plates, this 
most interesting flora as the paleobotanist, who is at the same time a geologist, 
looks at it. 
In the Maryland deposits of the Lower Cretaceous, BERRY has recognized 
145 species in 58 genera, and some appreciation of the vastly greater number 
of recorded species may be obtained from the long lists of synonyms that appear 
under many species. The only modern generic names in the list are Selaginella, 
Equisetum, Pinus, Populus, and Sassafras, though of course numerous names 
imply resemblances to modern genera. The pteridophytes include 47 of the 
species, and 44 of these are thought to belong to the Filicales, the other 3 being 
one species of Selaginella and two species of Equisetum. The 3 new genera of 
Filicales proposed are Knowltonella (Matoniaceae?), Dicksoniopsis, and 
‘Dryopterites. 
The gymnosperms aggregate 63 species, 33 belonging to Bennettitales and 
29 to Coniferales, the remaining one being a Baiera (Ginkgoales). Among the 
Bennettitales, Ctenopsis and Dichotozamites are proposed as new genera, the 
latter founded upon forms heretofore referred to Sequoia. The angiosperms 
are represented by 35 species, 3 of which (in 3 genera) are monocotyledons, 
and among these Alismaphyllum is a new genus. The 32 species (14 genera) 
of dicotyledons include Nelumbites as a new genus. 
In another part of the volume, BERRY summarizes the Lower Cretaceous 
floras of the world (53 pp.), listing the recorded species in the various countries. 
The volume should be very useful to that increasing number of botanists 
who are becoming interested in paleobotany, for the scattered and chaotic 
‘material of this period has been sifted and brought together in more available 
form.—J. M. C. 
Phylogeny of plants 
‘ In 1907 Lotsy began the publication of his lectures on the phylogeny of 
plants, for the use of students of taxonomy. The first volume? contained over 
7See Bor. GAZ. 433421. 1907. 
