198 Rhodora [OCTOBER 
" Exoperidium breaking into very small flakes, which usually dry 
up and remain attached to the inner peridium....At least in our 
herbarium specimens, this is a very constant character... . Endoperi- 
dium....usually rough with adnate scales, remains of the exoperi- 
dium." 
(Lloyd, Мус. Notes, No. 13 (1903), pp. 123 & 126.) 
“The outer peridium of Mitremyces is of the nature of a more or less 
gelatinous volva,.... It presents three types. In cinnabarinus, 
insignis and lutescens, it separates from the endoperidium leaving 
the latter relatively smooth. In Ravenelii, Tylerii, orirubra and 
Junghuhni it breaks into areas and dries more or less as scales on the 
endoperidium. In fuscus it falls off as a cap." 
(Lloyd, Мус. Notes, No. 20 (1905), p. 238.) 
In essentials, my own observations at Falls Church confirm those of 
Professor Beardsley. In dry weather, at least, the exoperidium is not 
noticeably gelatinous. It is thinnest near the foot-stalks, and thickest 
in a zone around the mouth. As a result of this differentiation the 
lower part has too little tensile strength to cohere when shrinkage takes 
place at maturity. Instead, it breaks into small patches which adhere 
to the endoperidium,— a character well shown by herbarium speci- 
mens. ‘The upper part, however, is thicker and tougher, so that it 
tears away entire from the upper third or fourth of the endoperidium 
and drops off as a cap, or as a stellately laciniate plate, leaving a gla- 
brous zone around the mouth. There was a detached cap lying near 
each mature plant in the colony of Colostoma Ravenelii at Falls Church. 
The brilliant coloring of these caps, inside up on the green moss, was 
what attracted my attention to the colony. They are vermilion at the 
center, surrounded by strongly contrasting yellow. | 
BUREAU or PLANT IxpvsTRY, 
U. S. Department of Agriculture, 
Washington, D. C. 
PLANTS NEW TO VERMONT.— The Vermont Botanical Club held а 
two day's field meeting July 6—7, 1909, with headquarters at Burling- 
ton. ‘The first day was given to Au Sable Chasm, New York, and the 
second day to the interesting botanizing regions about Burlington, viz: 
the sandy beaches and rocky bluffs of Lake Champlain, the old river 
bed at High Bridge, and Woodwardia Pond at Fort Ethan Allen. 
