江西省资溪县马头山蕨类植物区系

马头山蕨类植物区系由 3 0科 62属 1 42种组成。区系地理成份复杂 ,科属的地理成份以热带亚热带性质为主。主要的科是鳞毛蕨科 (2 5种 )、水龙骨科 (1 8种 )、金星蕨科 (1 5种 )、卷柏科 (1 1种 )、蹄盖蕨科 (1 1种 ) ,5科占总种数 5 6.3 4%。主要的属是鳞毛蕨属 (1 6种 )、卷柏属 (1 1种 )、凤尾蕨属 (8种 )、铁角蕨属 (8种 )、复叶耳蕨属 (5种 )、假瘤蕨属 (4种 )占总种数 3 6.62 %。马头山蕨类植物区系属的地理成份可分为 8个 ,主要是泛热带 (1 9属 )、热带亚洲 (7属 )、世界广布 (1 9属 )成份 ,占总属数 72 .5 8%。而种的地理成份则以亚热带山地成份为主 ,本区东亚成份突出 ,加上中国特有成份共占总种数的 66.2 1 %。显然应是东亚植物区系的一部分。掌叶假瘤蕨为江西省首次发现。

Studies on the pteridoflora of Matoushan Mountain of Zixi County,Jiangxi Province

There are 142 species of pteridophytes 62 genera belonging to 30 families in Matoushan Mountain. Floristic and geographic elements in Matoushan are complicated. At family and genus level,tropical-subtropical distribution types are dominant. The dominant families are Dryopteridaceae with 25 species,Polypodiaceae with 18 species,Thelypteridaceae with 15 species,Selaginellaceae with 11 species,and Athyriaceae with 11 species,these five families comprise about 56.34% of the total pteridophyte flora. The dominant genera are Dryopteris with 16 species,Selaginella with 11 species,Pteris with 8 species,Asplenium with 8 species,Arachniodes with 5 species,and Phymatopteris with 4 species. These six genera comprise about 36.62% of the total pteridophyte flora. The geographical distribution of the genera of pteridophytes in Matoushan Mountain can be grouped into 8 types. Pantropic with 19 genera. Tropica Asia with 7 genera and Cosmopolitan with 19 genera are the dominant types,constituting about 72.58% of the total genera. While at the species level,subtropical montane species are the dominant. East Asia element takes the largest proportion,including Endemic Chinese elements,accounting for 66.21% of the total species. Phymatopteris digitata was found first in Jiangxi Province.