<研究報告>日本産細胞性粘菌 Dictyostelium purpureum OLIVE の2型について

概要

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Two forms of Dictyostelium purpureum OLIVE were recognized in Japan. One is named "temperate form", which makes large sorocarps often exceeding 6 mm in height and produces comparatively elongate spores (2.1 < length/width < 3.0). This form is distributed in most of all Japan. Another form named "subtropical form" has been obtained only from Okinawa Pref. In the southernmost part of Japan, and is characterized by the following morphological features. 1) It makes medial sorocarps, not extending to 6 mm in height though its prostrate sorocarps are often exceeding more than 1 cm in length. 2) If prostrate, its sorophores often bear very welldeveloped supporters. 3) Its sori is rather black than dark purple when mature. 4) Its spores are thicker (1.4 < length/width < 2.3). The subtropical form prevails in Taiwan and Nepal. As a result of observations of the type specimens, the subtropical form is identical to Dictyostelium purpureum in the strict sense.