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Re:PHOTO:TB: Louisa's Song (Blyth 99)

  • Subject: [iris-photos] Re:PHOTO:TB: Louisa's Song (Blyth 99)
  • From: "Neil A Mogensen" <neilm@charter.net>
  • Date: Thu, 9 Dec 2004 12:56:22 -0500

Adam, the "Umbrata" concept is still fluid.  Fred Kerr prefers to call this phenomenon a "Corona" which is rather appealing.
As I understand "Umbrata", it refers to the fall surface overlay of dark color  (and texture, probably), which usually leaves a relatively narrow band of the underlying color showing--as in LOUISA'S SONG .
The band can be absent, extremely narrow (as in ROMANTIC EVENING) or very wide.  In some expressions it either interacts with a separate factor or is expressed with an allelic variant so that the part of the pattern near the beard is expressed with heavy lines in the veins radiating out into the fall, the spaces between being white or some light carotenoid color--yellow, orange or pink.
Some seedlings from HAPPENSTANCE crossed with a clean full Umbrata sort produced some yellow seedlings with a scruffy looking flush of color radiating outward from the beard.  I believe this is due to part of the Umbrata allelic series as nothing else was present to account for the pattern.
The band as the defining characteristic was part of Linda Mann's original suggestion proposing the term.  The problem with the band, however, is what it is NOT, not what it is.
And interesting example is MASTERY.  The fall band is a different color from the standards.  The variety appears to be a dominant amoena I(s) as well as having an Umbrata overlay.  If the band defined the concept, one would expect the band to match the standards being white, yellow, pink or orange in color.
The word itself is from the Latin root for "shadow".
The photo is beautiful--and thank you for posting it!
Neil Mogensen  z 7 western NC mountains.

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