|
''Ophioglossum'', the adder's-tongue ferns, is a genus of about 25-30 species of ferns in the family Ophioglossaceae, of the order Ophioglossales. The name ''Ophioglossum'' comes from the Greek, and means "snake-tongue".〔(eFloras: ''Ophioglossum'' ) . accessed 2.14.2014.〕 Their cosmopolitan distribution is mainly in tropical and subtropical habitats.〔 ==Description== Adders-tongues are so-called because the spore-bearing stalk is thought to resemble a snake's tongue. Each plant typically sends up a small, undivided leaf blade with netted venation, and the spore stalk forks from the leaf stalk, terminating in sporangia which are partially concealed within a structure with slitted sides.〔 When the leaf blade is present, there is not always a spore stalk present, and the plants do not always send up a leaf, sometimes going for a year to a period of years living only under the soil, nourished by association with soil fungi. The plant grows from a central, budding, fleshy structure with fleshy, radiating roots. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ophioglossum」の詳細全文を読む スポンサード リンク
|