Help: humongous leaves!

Tony Travis ajt at
Wed Oct 28 19:05:15 EST 1992

In article <921028213443.MIN-LRFAa14349.bionet-news at> you wrote:
: [... discussion about black oak ...]
: Other morphological traits typical of shade leaves are: lower specific leaf
: mass and leaf density, thinness, fewer stomata per unit leaf area and larger
: guardcells.

I'm interested in that observation, Mark.  It is common to find more
stomata on the lower (abaxial) epidermis of leaves than on the upper
epidermis.  One difference between the two surfaces is that the lower
epidermis is shaded by the rest of the lamina.  Do you think there is
any physiological significance in the presence of larger guard cells?

Dr. A.J.Travis,                       |  Tony Travis
Rowett Research Institute,            |  JANET: <ajt at>
Greenburn Road, Bucksburn,            |  other: <ajt at>
Aberdeen, AB2 9SB. UK.                |  phone: 0224-712751

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