…In mosses, stomata are found in the sporophytes of hornworts, and in Marchantiales and other plants, air chambers are formed in the gametophytes, with vertical cracks in the cell walls opening as breathing holes. R. Florin conducted a comparative study of the structure of stomata in gymnosperms, revealing that there are two types of stomata formation process, and showed that the difference corresponds to the process of phylogenetic differentiation of gymnosperms. In this way, the relationship between the process of stomata formation and plant affinities is also important. … From [Gymnosperms]…The affinities between cycads, seed ferns, and ferns were already suggested when Oliver and Scott defined the seed ferns. Regarding the other large group of gymnosperms, the conifers, R. Florin proposed their affinities with the Cordaites in 1948-51, based on the study of many fossils from the Permian to Jurassic periods. On the other hand, with the discovery of the progymnosperms (also called progymnosperms) by C.B. Beck (1960), it was proposed that both the cycads and conifers originated from the progymnosperms of the Aneurophyton and Archaeopteris orders, respectively, and the phylogeny of gymnosperms is still debated today over whether it is monistic or dualistic. … *Some of the terminology that mentions "Florin, R." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…コケ植物では,ツノゴケ類の胞子体に気孔がみられ,ゼニゴケ類などでは配偶体に気室air chamberがつくられ,細胞壁の垂直方向の割れ目が呼吸口として開口する。フロリンR.Florinは裸子植物の気孔の構造を比較研究し,その形成過程に2型あることを明らかにしたが,その差が裸子植物の系統分化の過程と一致していることを示した。このように,気孔の形成過程と植物の類縁との関連も重視されている。… 【裸子植物】より…すでにソテツ類,シダ種子類およびシダ類の類縁性は,オリバーとスコットのシダ種子類の設定のときに示唆されていた。もう一つの裸子植物の大きな群,球果類については,1948‐51年にフローリンR.Florinが,コルダイテスとの類縁性を二畳紀からジュラ紀にかけての多くの化石の研究により提言した。いっぽう,ベックC.B.Beckによる前裸子類(原裸子(げんらし)植物ともいう)の発見(1960)により,ソテツ系,球果系ともにそれぞれ原裸子植物のアネウロフィトン目とアルカエオプテリス目から由来するという提唱もあり,裸子植物の系統については単元論,二元論をめぐり,現在でも論議が続いている。… ※「Florin,R.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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