402 BOTANICAL GAZETTE [NOVEMBER 
found only in the White mountains of New Hampshire. By a mistake 
the range of this species was indicated in map I of my monograph as 
being in western North America. The error is not fatal, or even 
serious, as in the text (p. 173) the region is indicated properly. I 
should like to call special attention to the blunder, however, and to 
ask that area 12 on map I be stricken out. 
A species which possibly occurs in North America, but whose presence 
cannot be proved as yet with certainty, is Z. hirtel/a Jord. I found 
three specimens of it in the herbarium of the Royal Museum at Berlin, 
mixed with specimens of #.' Americana, and ticketed “£. officinalis, 
flora boreal-Americ. (Hooker).”—RicHARD VON WETTSTEIN, Prag, 
Austria. 
ABORTIVE FLOWER BUDS OF TRILLIUM. 
DvurRING a course of study upon the development of pollen grains, 
an attempt was made to secure early spring buds of Trillium. Plants 
taken from beneath the still frozen soil near Ithaca on April 5 were 
examined. Among fifteen plants one bud was found about 1 a 
in length, in which the pollen mother-cells had already separated from 
one another and were undergoing nuclear division. The other four- 
teen plants had minute buds 3 or less in length, in some cases the 
leaves of the perianth being distinguishable with the naked eye, 
others only a slight projection above the receptacle being made out. 
Some of these small buds were treated with collodion and sectioned, 
when the sepals were found to be clearly differentiated, but within nc 
only a confused mass of cells, many of them apparently dead, with 
almost no differentiation of petals, stamens, and pistil. 
On April 15 a large number of plants just appearing above oe 
were collected. Only a small proportion contained healthy buds, 4 
in these the pollen mother-cells were in the later stages of division, 0% 
in some cases, the pollen grains were already formed. Sixty plants 
which there were no growing buds were examined with a hand Jens: 
In only three or four did the lens fail to show some traces of a bud, 9 
some cases, as before, only aslight elevation. Usually the rudiment ofa 
perianth could be distinguished, either as a white speck or as ba: 
evident floral leaves, sometimes 2 to 3™ in length, but withered an 
evidently abortive. ds 
As care had been taken to collect plants with indications of buds, 
