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  sores on the leaves of Arum maculatum
From: "Peter Boyce" <P.Boyce at lion.rbgkew.org.uk> on 1997.12.03 at 08:58:15(1695)
James

The 'sores' on the leaves of A. maculatum in the book are true to
life, they really are both sunken and raised like black blisters.
This occurrence (bullate leaves) is also found in Biarum pyrami and
B. bovei where black-spotted leaves occur, also in Eminium
koenenianum where the 'sores' are white. Odder still, in some forms
of B. pyrami the 'sores' are plain green like the remainder of the
leaf.

Pete

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From: "James W. Waddick" <jim-jim at swbell.net> on 1997.12.03 at 12:01:46(1698)
>James
>
>The 'sores' on the leaves of A. maculatum in the book are true to
>life, they really are both sunken and raised like black blisters.
>This occurrence (bullate leaves) is also found in Biarum pyrami and
>B. bovei where black-spotted leaves occur, also in Eminium
>koenenianum where the 'sores' are white. Odder still, in some forms
>of B. pyrami the 'sores' are plain green like the remainder of the
>leaf.
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From: "Peter Boyce" <P.Boyce at lion.rbgkew.org.uk> on 1997.12.11 at 06:03:43(1729)
Dear James

The character of the raised and sunken spots on the leaves of Arum
maculatum is, like almost everything else about the species,
variable. Most of the spotted plants will have the spots flush
with the leaf surface, whereas a few will have them as the 'sores'
depicted in the Arum plate.

Happy observing

Pete

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