348 BOTANICAL GAZETTE [ocTOBER 
two alternatives: derivation from the lycopods, suggested by SEWARD; or 
derivation from the Abietineae, supported by JEFFREY. THOMSON dissents 
from both, and concludes that the araucarians have been derived directly from 
the Cordaitales. The objection to a lycopod origin is based chiefly upon the 
presence of leaf gaps, which THomson regards as of fundamental importance 
in indicating an origin by way of the fern stock. 
he objections to derivation from the Abietineae deal with many details, 
the pith of.them being that in the various anatomical details used araucarians 
resemble Cordaitales more than they do-Abietineae. JEFFREY has appealed 
to the Mesozoic plexus of “Abietinean-Araucarian” forms as indicating the 
origin of araucarians from the Abietineae; but Tomson concludes that these 
transition forms indicate that Abietineae have been derived from the arau- 
carians, and he claims that this conclusion is confirmed by the fact that the: 
araucarians are of greater geological age than the Abietineae. This last state- 
ment is based upon the fact that THomson and ALLIN'S investigated certain 
Permian and Carboniferous forms that had been ee to Pityoxylon and 
found that they do not belong to Abietineae.—J. M 
Marine flora of Woods Hole.—For a number of years Davis has been 
stu bastyiai the marine flora of Woods Hole and vicinity, part of the time in con- 
nection with the biological survey of the Bureau of Fisheries. The results have 
now. appeared in two sections of a bulletin of the Bureau of Fisheries, and- 
represent the most complete study of our marine algal flora up to this time. 
The first section deals with the ecology of the flora, such factors being dis- 
cussed as the coast, the bottom in deeper water, the tides and tidal currents, 
the effect of ice, depth of water, light, temperature and seasonal changes, and 
salinity of the water. The characteristic algal associations are described, their. 
number reaching 57. Special ‘reports-are also made on the algae of Spincle 
Rocks, Woods Hole Harbor, and on the distribution of the marine algae in the’ 
deeper waters of Buzzards Bay and Moores Sound. This section is accom- 
panied by 47 descriptive charts. ° 
The second section is a catalogue of the marine flora, the number of forms 
enumerated, with data concerning their distribution, being as follows: eee 
phyceae 37, Chlorophyceae 52, Phaeophyceae 74, Rhodophyceae 96. —J.M 

*s Toomson, R. B., and Attn, A. E., Do’ the Abietineae extend to the Carbon- 
iferous ? Bor. Gaz. Geri 1912. 
6 Davis, BRADLEY Moore, General PD Li oe of the algal vegetation of 
Buzzards Bay and Vineyard Scand t in the vicinity of Woods Hole; also A catalogue 
of the marine flora of Woods Hole and vicinity. © Bull: Bur. Fisheries 31 3443-5445 
798-833. th 


