80 
DE DIAGNOSTICA ET NOMENCLATURA 
MYCOLOGICA; ADMONITA QUAEDAM. 
SACCARDO-> 
I. “Authors of new species, who describe them at length 
both morphologically and biologically, should append diagnoses 
of them in the usual form, in English, French, German or Italian, 
but above all, if it be possible, in Latin. The scattered and 
often incomplete statements of essential characters are found 
only with difficulty in the long and frequently formless descrip. 
tions. In consequence, the diagnoses available for systematic 
compendia are often vitiated, entirely through the fault of the 
original authors.” 
Approved but add that the essential differences between 
allied species should be emphasized and distinguished. 
Il. “The host plants of fungi shall be designated by thew 
Latin names, and not by vernacular names in English, Italian, 
&c., which are often of doubtful meaning. 
“Tt is of the utmost importance that every author should indi- 
cate the matrix, or host plant, particularly of parasitic fungi.” 
Approved but add that in the case of non-parasitic fungi the 
kind of wood or nature of the soil should be designated if pos- 
sible and in the latter case the kind of surrounding vegetation, 
e.g., dead elm stump, under oaks on calcareous soil, &c. 
Ill. “The metric system alone shall be used in indicating 
measurements. When these are small, the micromillimeter 
should be employed. Fractions of millimeters, or other measure 
ments, burdened with marks or signs, are ready sources of error. 
Approved. 
IV. “For the sake of brevity, the sign ¥, already in. use 
since 1872, should be employed between figures indicating the 
extremes of length and width of microscopic organs, in place of 
the sign x, =, :, which are made use of by mathematicians 10 
another sense.” a 
Dissented from and resolved that the use of the old Saim! 
Andrew’s Cross be maintained as having received the sanction 
of intelligible usage, and that the sign »¥, would be almost 
unintelligible to ordinary botanists. 
