1918] CURRENT LITERATURE 183 
Evans” has described 4 new species of Lejeunea from Florida, 2 of which 
seem to be endemic to that state. Of this group of liverworts Florida is now 
known to contain 44 species of the 48 recorded from the United States. 
FERNALD" has described 2 new species of vig (R. johannensis and R. 
Williamsii) from northern Maine and adjacent Can 
PretcH” has described 138 new species of fungi artis Ceylon, ——* 
ye earn 75 genera. Among them there are 32 new species 0 
WIEGAND’ has published the result of his studies of Elymus in Seen 
North America, discussing 7 species, one of which (E. riparius) is described 
as new.—J. M. C. 
Phylogeny of Filicales.—In continuation of his studies of Filicales, BowER™ 
has presented the Pteroideae. The observed details of phyletic relationships 
among the genera are too numerous to recite, but the paper contains a wealth 
of material for the special student. In a former paper of the series BOWER 
suggested that the leptosporangiate ferns, exclusive of the Osmundaceae, may 
be open into two Asiana haat series: the Superficiales, in which the 
origin of th m the surface of the leaf; and the Marginales, 
in which it is as SS acai. pee ie margin. All of the Pteroideae belong to 
the Marginales, and they show analogies with the Superficiales, especially in 
those forms which have apparently superficial sori. He shows that such sori 
result from ‘‘a slide of the marginal sorus to a superficial position.”’ ‘‘ The 
Superficiales are believed to represent ferns in which that slide took place so 
early in their descent that the two sequences must be held to be phyletically 
distinct, notwithstanding those analogies.” —J. M. C 
Atmometry.—The desirability of having an atmometer so constructed as 
to indicate the magnitude of the atmospheric evaporation power at any given 
moment is discussed by JoHNSTON and LivincsTon.'’ Attempts to produce 
such an instrument are described, but so far it has not been possible to over- 
come certain difficulties in converting evaporation power into pressure. The 
nearest approach to such an instrument which has proved successful is a device 
© Evans, A. W., Noteworthy Lejeuneae from Florida. Amer. Jour. Bot. 5: 
131-150. — 5. 1918. 
™ FERNALD, M. L., Rosa ee and its allies of northern Maine and adjacent 
Canada. Poe 20: mek x 
"Petco, T., Additions to sa fungi. Ann. Roy. Bot. Gard. Peradeniya 
6:195-256. 1917. 
*3 WrEGAND, K. M., Some oe and varieties of Elymus in Eastern North 
America. wicias 20:81-90. I 
4 Bower, F. O., emg in ~ phogeny of the Filicales. VII. The Pteroideae. 
Ann. mad 32: 1-68. jigs. 4 
*S JOHN , EARL ee ite etic B. E., Measurement of evaporation rates 
for short able sided Plant World rg: foie 1916. 
