1924] Morse,—Lepidium latifolium in New England 197 
EXPLANATION OF PLATE 148. 
All drawings of this plate were made by the aid of a camera lucida 
Scale = 10 u in each case. The magnifications given below are 
merely approximate. 
Fig. 1. Low power drawing to show the nature of the peridium of Rhizo- 
pogon occidentalis. The compact and more deeply colored outer layer at the 
left and the crowded, intertwining, almost parallel middle region contrast 
strongly with the loosely interwoven hyphae of the peridium of R. truncatus. 
Mounted in 10% glycerine. X 273. 
Fig. 2. A group of spores ot R. occidentalis showing their narrow elliptical 
form. Mounted in eosine-glycerine. X 1125. 3 
Fig. 3. Spores of R. truncatus drawn to the same scale as Fig. 2 to illustrate 
the ovoid-elliptical, truncate shape, and the dark deeply staining basal region. 
Mounted in eosine-glycerine. X 1125. 
Fig. 4. A typical basidium of R. occidentalis with its short sterigmata. 
In eosine-glycerine. X $825. 
Figs. 5-6. "Typical basidia of R. truncatus with their stouter and more 
elongate sterigmata. Drawn from material crushed in 10% eosine and 
glycerine. X 825. 
Fig. 7. Low power drawing of the peridium of R. truncatus. Note the 
. irregular outline of the peridium,—on the left,—and the loose tangled hyphae 
of which it is composed. Bundles of hyphae may be seen running at right 
angle to the plane of the section. Mounted in 10% glycerine. X 273. 
LEPIDIUM LATIFOLIUM IN NEW ENGLAND. 
ALBERT P. Morse. 
In late July of this year Mr. R. B. Mackintosh of Danvers brought 
in for the Peabody Museum flower-table specimens of a cruciferous 
plant whose bushy habit of growth, with tough, branching stems 
and spreading corymbose, fine white inflorescence, was suggestive of 
that of our common Ceanothus americanus. The immature fruit 
pointed to Lepidium or its proximity. Search in our local Essex 
County herbarium and in the New England collection at the Boston 
Society of Natural History failed to disclose the plant; nor was it to 
be found in that of the New England Botanical Club at Cambridge. 
Through the kind efforts of Dr. N. C. Hirschy of Berea College, who 
was at the Gray Herbarium at the time, it was satisfactorily identified 
as the Old World Lepidium latifolium L. 
This is a widely distributed species, being found in many parts 
of Europe except in high altitudes and latitudes, in North Africa, 
and in southwestern Asia as far east as Turkestan and Thibet. It is 
also common in Mexico, probably having been introduced from 
Europe. 
