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w
αntarctica) がキク科濯木 (Chilio­
trichum) ・イネ科草本 (Festuca ， 5t伊a など)と疎林を
形成する地域は，年降水量 400-450 mm の半乾燥域
にあたり，表層花粉は Nothojagus ，
Tubuliftorae,
Poaceae の混合群集で、特徴づけられた.その混合比は
大きなばらつきを示し，木本花粉は Nothojagus を除
き完全に消滅していた.
これに対し，年降水量が 300
mm に満たずイネ科による大草原(乾燥ステップ)が
成立する大西洋側では，ナンキョクブナ属が全く生育
していないにもかかわらず Nothojagus 花粉がイネ科
花粉群集に一定の割合で随伴した.大西洋側の乾燥ス
テップは植皮率が低い上，偏西風の風下にあたるため
太平洋(tlIJ の森林域からくる遠距離飛来花粉の影響を強
く受けていると考えられる.
多産が特徴的だった.それ以外は Podocaゆ us/Dacry-
-
pumilio , N.
11 ー