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THE UREDINEAE AND USTILAGINEAE OF
ESSEX : A CONTRIBUTION TO THE FLORA
OF THE COUNTY.
By F. J. CHITTENDEN, Technical Laboratories, Chelmsford.
SO far as I am aware, the only lists of records for Essex of
the occurrence of the interesting rust and smut fungi at
present published are those by Dr. M. C. Cooke in the Essex
Naturalist 1887, pp. 185 et seq., and by Mr. E. D. Marquand
in his list of plants collected by the late Mr. E. G. Varenne,
M.R.C.S. (E. N., V. 1891, pp. 21-23).
The following list is compiled (1) from the records got
together by Mr. A. W. Heaver, of Maldon, as the result of the
work of a class held in that town for the study of these fungi,
which he has kindly allowed me to use, (2) from specimens
collected by Mr. H. Whitehead, of the Essex Field Club
Museum, which he has kindly allowed me to examine, and (3)
from specimens in my own herbarium collected either by Mr.
E. E. Turner, of Coggeshall, or by myself.
The nomenclature of Plowright's British Uredineae has been
followed in the list ; the various forms, aecidia, uredo, and
teleutospore forms of the same fungus, when such alternating
forms occur, being listed under one name. The following list
differs in form from the two cited above, in which the different
forms are mostly listed under different names, e.g., the three
forms of the corn rust, Puccinia graminis are given in Dr. Cooke's
list under "AEcidium berberidis," "Uredo linearis," and "Puccinia
graminis" ; on the other hand, in a few cases more than one
fungus is included under one name, e.g., in Mr. Varenne's
collection, now in the museum of the Essex Field Club, and
which, through the courtesy of Mr. Cole, I have been able to
carefully examine, I find specimens of Phragmidium fragariastri,
P. tormentilla and Uredo agrimoniae included under the name
"Uredo potentillarum D.C." These differences in nomenclature
have arisen largely through research into the life-histories of the
rust fungi, but they make comparison of lists published at
various times a somewhat laborious task, and accurate com-
parison in the absence of specimens very frequently an absolute
impossibility. I have therefore inserted the names used by