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shape ; the ridges are deep and sharply cut as a rule, with the strim 
clearly marked and running obliquely in two directions; those above 
the median line, where the striae are horizontal, running in a plane 
uearly at right angles to those below it. The two forms scem nearly 
identical microscopically ; the spores and peridial eells of z are perhaps 
slightly smaller, but otherwise it differs from y only by its smaller 
size and faded yellow color. 
It should be remarked, that, from a microscopic point of view, the 
ßoestelia obtained on Crataegus after sowing G. clavariaeforme 
was identical with the form x; while in habit it resembled y very 
closely, the peridia beiug but slightly lacerate. It must be remembered, 
however, that the cultures were not exposed to the weather, being 
kept indoors during their whole developmeut, and that, had they been 
exposed to rain and wind, a different habit might have supervened, 
as w r as the case with the ßoestelia obtained from raacropus, 
where the penicillate habit was preceded by one very similar to that 
obtained in the present instance, the ßoestelia producing slender un- 
brokeu peridia, which became lacerate and curled backwards only after 
exposure for a short time to rain and wind. The same absence of 
any laceration was marked in the case of the aurantiaca culture, 
where the usually lacerate peridia were unbroken. 
Of these three forms, the first, x, seems to me to be the true 
lacerata, as understood by Oersted and distributed as above men- 
tioned. As regards the other two, no definite Statement can be made. 
It should be noted, however, that, with the exception of a slight Va- 
riation in the size of the spores, neither of these forms can be satis- 
factorily separated microscopically from ß. cornuta, as it occurs in 
this country on Pyrus Americana and Amelanchier, or from 
a form with the cornuta habit, collected at Kittery, Maine, on Py- 
rus arbutifolia, apparently a new host for this species. Moreover, 
the form y often assumes a habit identical with the most typical cor- 
nuta, if somewhat more slender. This I have frequently observed 
at Kittery, and it is well shown by specimens collected in Massachu- 
setts by Mr. Seymore, who has kindly allowed me to examine the 
ßoesteliae in his herbarium. The possibility that these forms y and z 
are one or both cornuta, isa natural inference from the above 
' facts. Tet, as already remarked, it is impossible from our present 
knowledge of them to consider it more than a conjecture. 
Turning for a moment to my culture of G. conicum, it should 
be observed that the ßaestelia obtained had the typical cornuta 
habit, yet was not separable microscopically from the form y, while 
the date of development corresponds with neither, being earlier by 
about two months or more. This rapid development is therefore not 
easily explained, as the ßoestelia is not referable to any other form. 
That it was accidental is rendered more probable from the fact that I 
was unable to find any such ßoestelia during June in localities where 
G. conicum was abundant. 
No microscopic examination of the spermogonia obtained was at- 
tempted, an in general they presented much the same appearauee. 
Those from clavipes, however, were the least conspicuous and those 
