ReEvricuLaARiA UMBRINA I. 
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witch-hazel. 
In Dr J. Rostafinski’s Monograph of the Myxogasters, Reticularia 
lycoperdon Bull, has been substituted for the name in common use. This 
Monograph, being based on an entirely new system of Classification, necessi- 
tates a change of name in numerous instances. How thoroughly different the — 
system, and how wide spread the change of names therein inaugurated may be 
inferred from the following facts. Of the hundred or more species given in 
the Handbook of British Fungi less than one-fourth remain under their old 
names. Three out of the four species of Reticularia are referred to as many 
different genera, leaving one species only in the genus and another specific 
name is given to that one. The generic name Fuligo takes the place of 
ZEthalium, and the two supposed species, 42. seplicum and A’. vaporiarumn, 
help make up a page of synonyms under the name Muligo varians. The genus 
Diderma is discarded and its thirteen species are distributed among three 
genera, Chondrioderma taking the largest share. In several instances two, 
and in one or two cases three supposed species have been united in one. The 
genus Physarum has had its characters so modified that it now comprehends 
species that before were found in Diderma. Didymium and Angioridium ; and 
one of its species, Physarum nutans, with its varieties, has been transferred 
to Tilmadoche and separated into two species. 
The adoption of so many new names at once will necessarily be attended 
by some disadvantages, yet we think the advantages to be derived from the 
adoption of this new method of classification will more than compensate for 
the temporary inconvenience. One thing is quite evident to my mind, and 
that is, that the species may be more satisfactorily referred to their proper 
places by this system and by the description, given by Rostofinski than they 
ossibly could be by the old system and deseriptions. 
The following is a list of the New York M resent known, 
The names m the first or left hand column are those required by an 
arranged according to the new system ; those in the second column are the old 
names, applied to such of the species as have before been reported and 
published as New York species: 
Present Names. Former Names. 
Physarum cinereum Batsch. Didymium cinereum Fr. 
P. contextum Pes. Diderma flavidum Pk. 
ig flavidum Pk. Didymium flavidum Pk. 
Pp; sipuosum Dull. Angioridium sinuosum G'reo. 
i polymorphum Mont. Didymium connatum 17k. 
a. albicans Pk. D. subroseum Pk. 
i citrinellum Pk. Diderma citrinum Lr. 
. luteolum Pk. 
Zz, inzequalis Pk, 
Pp. ornatum Pk. 
P; atrorubrum Pk, 
a. psittacinum Ditton. 
'F pulcherripes Pk. Physarum pulcherripes Pk, 
 yexigaean nutans Pers. nutans Pers. 
mutabile R. 
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