48 _JMedical Botany. 
pound flowers, on the interior of fistular twigs, on the living 
leaf growing from under the epidemis, and (if the Clavus 
be admitted to belong to ae genus,) from within, or near to 
the germen in the Gramin , and developed in the place of 
thatorgan. All this diversi of situation is similar to that 
of many.other F'un 
Third. It does not affect. the general health of the plant 
upon which it grows, which is more remarkably the fact, 
with respect to the genus Selerotiwm, than of any other para- 
sites, as all the species, except S. Cyparissie, are developed, 
only afier the plant has done flowering, or when it tends to 
deca 
i The Clavus, like other parasitic Fung?, is strictly 
topical, as one or more seeds in the same ear, may be com- 
pletely destroyed cod it, and the rest remain perfectly in 
their natural conditio 
Fifth. The ional of the growth, and the maturity of 
the Clavus, like other parasitic Fungi, has no correspon- 
as with that of the Bisby or any part of it, on Beh it 
s found. 
” Sinth, The Clavus is not “peculiar to one plant, bu 
found 4 a considerable variety rt that differ very widely a 
each other. This is true of other parasitic Fungi, and it 
ew overthrows the opinion, that it is merely a morbid 
change of the seed, as it would be incredible, nay indeed 
impossible, that individual seeds, so diverse as those of Se- 
cale, Alopecurus, Arundo, Festuca, Phalaris, Lolium, Phle- 
um, &e. should be converted into the same article. 
Seventh. Increased humidity favours the production of 
Clavus, as it is said to do, of all the species of Sclerotium ; 
but neither Clavus, nor any Sclerotium, can be produced, 
by any degree of artificial humidity. In addition Clavus, 
and all the Scleroteums, abound more in certain districts, 
than in others, though eee circumstances are equally 
favourable for ap produc 
Eighth. lavus, Gee other Fungi of a soft substance 
when young, abot seeds are commonly developed im a 
position, that does not admit of complete and free expan- 
sion, has the curious property of moulding itself in some 
measure, to the surface of the obstacle which presents itself. 
Nint he chemical composition of the Clavus, as far 
as the subject has been investigated, seems to correspond 
