簡介
學名Desmatodon
科名叢蘚科Pottiaceae
屬名鏈齒蘚屬Desmatodon
外觀中文名鏈齒蘚屬
中文異名
描述
屬31鏈齒蘚屬DesmatodonBrid.Mont．Musc．86.1819.
模式種：鏈齒鮮D.latifolius(Hedw.）Brid.
植株矮小，疏叢生。莖短，單生，稀分枝。葉乾時略皺縮，濕時傾立，常內折；呈闊卵圓形、狹長倒卵形、長卵圓形或長橢圓狀舌形；葉邊疣全緣，上部有時具細齒，平展，下部稍背卷，有時具明顯的分化邊緣。中肋長達葉尖或突出呈短刺芒狀，或呈長毛狀，平滑或具疣；葉細胞較大，排列疏鬆、整齊，呈4-6邊形或菱形，薄壁，或稍帶圓形而壁略增厚，背腹兩面均密被馬蹄形或圓環形細疣，疣不超出胞腔，故細胞界限清晰；基部細胞較長大，呈不規則長方形，平滑透明。雌雄同株。雄生殖苞具棒褪狀配絲。雌苞葉與一般葉同形。蒴柄長，直立，旋扭或成鵝頸狀彎曲。孢蒴整齊，卵狀圓柱形，具環帶，成熟後自行卷落。蒴齒具矮的基膜，齒片短而平，呈披針形，常2-3裂，具細密疣，直立或一次左旋；蒴蓋錐形，具斜喙；蒴帽兜形，平滑。孢子大，黃色或紅棕色，具粗疣。
本屬全世界約有36種，在南北兩半球的溫帶及寒冷地區均分布。我國記錄有10種，多分布於溫帶較寒冷的高山地區。
分種檢索表
1.葉邊全緣；孢蒴直立或稍傾立································2
1．葉邊上部具細齒；孢蒴平列或垂傾·····························7
2.葉呈闊卵形；葉細胞平滑無疣····················8.
合柱鏈齒蘚D.systylius
2.葉長卵圓形或長倒卵形；葉細胞具疣·····························3
3.葉緣無分化邊；葉中肋長不及葉尖，或僅稍突出成小尖頭，不呈長芒狀毛尖．···········4
3.葉緣具明顯的分化邊；葉中肋突出葉尖成長芒狀························5
4.葉片呈等腰三角狀披針形；中肋自葉尖突出成小尖頭·········1.細葉鏈齒蘚D.capillaries
4.葉片呈橢圓狀舌形；中肋在葉尖稍下處即消失··········6.
粗疣鏈齒蘚D.raucopapillosum
5.葉片呈卵形，先端漸尖；葉細胞的疣不規則··············7.
北地鏈齒蘚D.suberectus
5.葉片呈長橢圓狀舌形，先端圓鈍；葉細胞具馬蹄形或圓環狀細疣·················6
6.中肋自葉尖突出呈長毛狀；孢蒴直立···················4.
鏈齒蘚D.latifolius
6.中肋在近葉尖處即消失，不突出葉尖；孢蒴平列或垂傾··········
·5.泛生鏈齒蘚D.laureri
7.葉中肋突出葉尖，具短尖頭；葉細胞平滑無疣············
10.雲南鏈齒蘚D.yunnanensis
7.葉中肋多在葉尖稍下處即消失；葉細具疣···························8
8.葉邊先端密被尖齒；葉上部細胞呈多角狀圓形，壁厚，具多數芽胞體····3.芽胞鏈齒蘚D.gemmascens
8.葉邊先端疏被微齒；葉上部細胞呈4-6邊形，壁薄；無芽胞體···················9
9.葉呈狹長卵狀披針形，先端漸尖；中肋長達葉尖··············2.狹葉鏈齒蘚D.cernuus
9.葉呈橢圓形，先端圓鈍；中肋在葉尖稍下處即消失············9.西藏鏈齒蘚D.thomsonii
