269 
Mexico—Additions to the Phenogamic Flora of. B. L. Robinson 
and H. E. Seaton (Proc. Am. Acad. Arts and Sci. xxviii. 103). 
New species are described in the genera /halictrum, Polygala, 
Abutilon, Pavonia, Astragalus, Stylosanthes, Cotyledon, Sedum, 
Cuphea, Fuchsia, Cyclanthera, Piqueria, Stevia, Eupatorium, Brick- 
ellia, Sabazia, Verbesina, Ti vridax, Schkuria, Senecio, Cacalia, Cnicus, 
Perezia, Lobelia, Arctostaphylos, Gentiana, Halenia, Krynitzkia, 
Russelia, Castilleia, Pedicularis, Dicliptera, Salvia, Spiranthes, and 
Dioscorea. 
Monilia fructigena—On. James Ellis Humphrey (Bot. Gaz. xviil. 
85, with plate). 
Myxomycetes—On two new or emperfectly known. W.C. Sturgis 
(Bot. Gaz. xviii. 186, 187, one plate). 
Description and illustration of Comatricha cespitosa, n. sp.,and 
Physarum sulphureum, Alb. & Schw. 
Natadacee of North America. Thomas Morong (Mem. Torr. Bot. 
Club, vol. 3, No. 2, pp. 65, 55 plates; issued March 15, 1893). 
So little has been done with the order named above, since the 
work of Chamisso in Linnza, vol. 2, 1827, and the 3d Mantissa of 
Roemer and Schultes, which appeared after the Linnza, though 
in the same year, that one feels constrained to welcome a publica- 
tion on it, especially coming. from an author who has studied it 
for many years; and if we cannot agree in all points with him, 
we at least know it is the outcome of honest work and ripe judg- 
ment. 
The difficulties attending the order, especially its principal genus 
(Potamogeton), are by no means small, and while we advance 
slowly in the acquired knowledge of it, it may be trusted, that it is 
sure, 
In another place (*) I have mentioned more particularly the 
geographical distribution of Dr. Morong’s Monograph, and I pro- 
pose to take up some other points here. 
The question of hybrids has lately been much written on in 
Great Britain, and while it would be ridiculous to deny the exist- 
ence of natural hybrids, I do not believe they are as common as as- | 
serted. Of course, those who support it have a strong position, as it 
* Journal of Botany, 1893. 
