[NatureNS] Poplar gall ?

From: David & Alison Webster <dwebster@glinx.com>
To: NatureNS@chebucto.ns.ca
Date: Fri, 26 Apr 2013 10:55:06 -0300
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Dear All,                        Apr 26, 2013
    Yesterday, in North Alton, I noticed a growth of some kind in the crown 
of a whippy Poplar that had bent over; fibrous at the base and within, 
cracked and firm on the outer rounded surface, attached in the crotch of a 
small branch and about 3 cm across.
    When detached from the tree it readily crumbled into several pieces. 
Near the base, in chinks between the several parts there were clusters of 
tiny spherical smooth shiny eggs (?).not quite 1 mm in diameter.
    The growth, whatever it is, looked old and weathered whereas the eggs 
looked relatively recent. Is this perhaps a growth of some kind, generated 
by one insect, that is subsequently used as an egg chamber by another insect 
?
    Comments ?
YT, DW, Kentville 

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