ヒシ白絹病菌（Corticium rolfsii）の水面浮上性菌核と水中沈下性菌核の発芽様式を比較観察した．両者は，外皮を解剖針で付傷すると付傷部位からのみ噴火状に発芽し，アンチホルミンで処理すると菌核表面から全面的に発芽し，菌糸状となった．乾燥処理した菌核の発芽は，浮上性菌核の方が沈下性菌核より早く，噴火状に発芽する割合も高かった．また，乾燥処理した菌核のインゲンマメ胚軸上での発芽は，浮上性菌核の方が沈下性菌核より早く，インゲンマメに対する病原性も強かった．両菌核とも，発芽時には外皮周辺の細胞の形態が変化しており，それより内部の細胞から出芽した．アンチホルミン処理あるいは乾燥処理を行った菌核の外皮は，無処理菌核と比較して皮膜との結合状態が緩く，この傾向はアンチホルミン処理菌核で顕著であった．

　A poisonous Tricholoma species, collected in a broad-leaved forest in Sado island, Niigata prefecture, was identified as Tricholoma pardinum, new to Japan. The poisoning by it was not fatal but gastrointestinal in its effects.

　Seedling damping-off of Jew's mallow (Corchorus oltorius) occurred in Kanagawa Prefecture, Japan in May, 1994. Twelve isolates of fungi were obtained from the deseased tissues. In inoculation tests at 15 and 25°C, only one isolate was pathogenic on Jew's mallow and radish seedlings at 15°C, but not at 25°C. The isolate from diseased plants was identified as Rhizoctonia solani, based on the morphological and cultural characteristics. The isolate anastomosed with standard isolate of AG-2-1 only and restriction fragment length polymorphisms (RFLP) patterns of internal transcribed spacers (ITS) region of rDNA were the same as those of the standard isolate of AG-2-1.