A Study of the Lactariae of the United States 
GERTRUDE SIMMONS BURLINGHAM 
CONTENTS 
List oF ILLUSTRATIONS 
INTRODUCTION 
Scope and aim of the work 
Collections of Zacfariae іп the New SE Botanical Garden 
Collections е for examination 
erbaria v 
aen treatment of the genus 
Arrangement of the genus in groups and sections 
Distribution of species 
Effect of latitude and elevation on distribution 
Relation of humus to species distribution 
РН Q QA ER EMI 
Structure and internal morphology 
Laticiferous vesse 
Probable causes of ‘the change in color of the latex 
olor-scheme and photography 
SYNOPSIS OF SECTIONS AND GROUPS 
EY TO KNOWN SPECIES OF LACTARIA IN THE UNITED STATES 
KEYs TO INDIVIDUAL GROUPS AND DESCRIPTION OF EEN INCLUDING SYN- 
ONYMS, DISTINGUISHING FIELD-MARKS, AND CRITICAL К 
INDEX... 
LIST OF ILLUSTRATIONS | 
(The photographs are all four fifths of the natural size of the plants) 
Бір. 1. Lactaria glaucescens Crossl.......... .......ӛ...-..... SEN 
Fig. 2. Lactaria speciosa sp. nov, e: 
№. 3. ctaria crocea sp. nov. А тулыр кт 
Fig. 4- Lactaria delicata sp. nov DONC CNN VIP obs ree 
Fig. 5. Lactaria agglutinata sp. поу........... т. RA 
Fig. 6. Lactaria lanuginosa sp. nov ася 52-021 
Tu 7. ctaria mucida sp. поу.......... essere PRE NODE MEN UM oS 
Fig. 8. Lactaria $ubpurpurea Peck.... а ооо Van uH ee 
Fig. 9, то. Lactaria ME Burl ана Тт о 
Fig. 11. Lactaria cinerea ен т 
Fig. 12. Lactaria "eech Meis KREE 
Fig. 13. Lactaria Peckii sp. nov SO Ee тк еба 
Fig. 14. Lactaria grisea Peck EE E 
Fig. 15. Lactaria isabellina Burl EE eege 
Memoirs of the Torrey Botanical Club, Volume 14, Мо. 1. 
[Issued 26 Му 1908. 
1 
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In Sta nn Oo Me 00-1 Ch bk о» ю юн 
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