volcano of the Ch6kai Volca 丑ic Zone a ロd is situated at the south ・ western cor 且 er of the Tsugaru Plain. Tlle J{ iniko district near the seashore of the Sea of Japan is characterized by many ponds or marshs . The main river systems ill the area surveyed are the Iwaki and the Narus哉wa . The surveys were made in tLe s− 011965 a ロ d in the sp 血 g and summer 互 d PoJ. auriculata were widely distributed . D . iaPonica was found in the stations below the altltude of about 525 metres ( inhabitable

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... ter temperature range , 9. 0 -25. 0℃). Ph . vivida was fo 繊 d in the stations within the alt 辻 ude range from about . 40 to 620 metres ( 5. 0 -15 . 0℃ )盆bove sea leveL It is however clear tbat 」 Ph. vivida is the species of oo 且 ・ dominance i 駐 the western part of Aomori Prefecture . Pol. a " riculata was common in the stations within the a 脆itude range from about 200 to l320 metres ( 5 , 0 -14. 5℃ ) . The type of the vertical distributio 皿 in the area surveyed 玉 s shown as J − JV