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sores on the leaves of Arum maculatum
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From: "Peter Boyce" <P.Boyce at lion.rbgkew.org.uk> on 1997.12.03 at 16:58:15(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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Peter Boyce
Herbarium
Royal Botanic Gardens, Kew
Richmond
Surrey TW9 3AE
U.K.
Tel. + 44 - (0)181 332 5207
Fax. + 44 - (0)181 332 5298
email. p.boyce@lion.rbgkew.org.uk
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From: "James W. Waddick" <jim-jim at swbell.net> on 1997.12.03 at 20:01:46(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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>
>Pete
Dear Pete;
Without a leaf to look at right now-although they are unrolling out
of the ground, I don't really recall seeing these raised and sunken areas,
just a smooth leaf with numerous small dark brown spots of color. Did I
just not notice the change in surface texture here?
Very odd, but gives me more to look for when they emerge fully.
The flowers do correspond exactly with the one illustrated and your
description in your book. I recall keying it out when I got your book. I
never quite trust some names until I get an authority for comparison and
verification.
Many thanks and I'll try to remember and report back.
Thanks Jim W.
James W. Waddick Voice: 816 746 1949
8871 NW Brostrom Rd E-MAIL: jim-jim@swbell.net
Kansas City MO 64152 Fax: 816 746 1939
Zone 5/6 - Winter low -10 degrees F Summer high +100 degrees F
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From: "Peter Boyce" <P.Boyce at lion.rbgkew.org.uk> on 1997.12.11 at 14:03:43(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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----------------------------
Peter Boyce
Herbarium
Royal Botanic Gardens, Kew
Richmond
Surrey TW9 3AE
U.K.
Tel. + 44 - (0)181 332 5207
Fax. + 44 - (0)181 332 5298
email. p.boyce@lion.rbgkew.org.uk
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