Sadleria cyatheoides

Hi all,
On a recent trip to Hawaii (Kona) I noticed large amounts of Sadleria
cyathiodes everywhere beginning abruptly at approx. 2200 feet elevation. All
had green emerging fronds. Then at around 3000 feet and higher they all
abruptly (so abruptly it hardly seemed possible) changed to identical looking
plants but all having red emerging fronds. Does anyone know for sure what is
going on? If its the cooler weather, then my S. cyatheoides here in coastal
San Diego should be red since its similar weather to 4000 feet there. If its
the added rainfall at the higher elevation, same thing since I water a lot
here. I know there may be a lot of different theories but does anyone know for
sure? I ordered Daniel Palmer's "Hawai'i's Ferns" and it doesn't say anything
about the red fronds. Could it really be a different variant or species? Has
anyone seen a red frond S. cyatheiodes at lower elevations in Hawaii.
Thanks,
Dean Ouer

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