go BOTANICAL GAZETTE [FEBRUARY 
Chlorophycee, numerous species of mosses, equisetum, éte 
The water in the ditches is only a few inches in depth, but ha 
a swift current. By the time it has reached the base of the hil 
it is but slightly warm. The older portions of the ‘‘ formation” 
on this hillside are composed of travertine produced by mossés. 
Collection no. 4 was made by Mr. Walter Harvey Weed it 
Yellowstone National Park during 1897, and sent to me for deter 
mination. This adds new localities and several new forms to the 
list. 
Collection no. 5 was made by Professor Francis E. Lloyd from 
hot springs in the region of the Cascade mountains, Oregon. 
OEDOGONIUM CRENULATO-cosTaTUM Wittr. var. AUREUM Tild. 
Am. Alg. Cent. II. no. 123. 1896. (Pl. VII, figs. 1, 2, 3) 
Oogonia single or 2~3-seriate, elliptical or oboviform, ope 
ing by a pore in upper portion; oosperms nearly filling be 
oogonia, exospore smooth, endospore crenulate-costate, reticu: 
late, orange-colored (aurantiacus) ; supporting cell similar to the 
other vegetative cells; filament of male plant slightly smalle 
than that of female; antheridial cells alternating with vegetall\t 
cells, 2~5-celled ; terminal cell (sometimes an oogonium ) obtust 
vegetative cells 10-13 w in diameter, 3.5-6 times longer; ong 
32-37 X 40-50 yn; oosperms 29-30 X 38-39}; antheridial oF 
1OX 104. In overflow from small hillside spring. a 
tepid. Between Middle and Upper Geyser Basins, Yelle 
stone National Park. J. E.T. 2 Jl 1896. 2 
The endospore in this plant is crenulate-costate, but id 
transverse as well as longitudinal costae; the dimensions of - 
vegetative cell differ a little from_ those given in the tyP 
description; the mature oospores are bright orange-coloreds? 
character not mentioned in the specific description ; it occurs 
thermal, flowing water, instead of cold stagnant water. a 
other respects the variety is similar to the species. a 
An Oedogonium was also found jn the tepid terrace waters 
Banff, but as it was not in fruit the description is omitted. sa 
like reasona species of Zygnema growing with it is not describe 
a 
