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Athyrium leiopodum (Hayata) Tagawa

小葉蹄蓋蕨

Athyrium leiopodum
Abaxial View

Credit: Liu, Yea-chen

Diplazium leiopodum Hayata, Icon. Pl. Form. 4: 217 fig. 148. 1914. Diplazium tenuicaule Hayata, Icon. Pl. Form. 4: 220. fig. 150. 1914.

地生; 根莖直立, 偶倒臥; 葉柄長5-20公分, 綠色, 草桿色或紫紅色,; 葉柄基部鱗片深褐色或黑色, 邊緣全緣, 具或不具黃色窄邊; 二回羽狀深裂至複葉; 一回羽葉長7-20公分, 寬3-7公分, 末端具漸尖至長尾尖; 葉軸及羽軸遠軸面均具短, 單細胞腺毛; 最下方一至三對一回羽葉基部小羽片具極短或不具柄, 上先型; 呈二回羽狀複葉, 其他部位小羽片基部收縮但不具柄; 二回小羽片末端圓鈍, 長0.5-3公分, 羽軸兩側羽片長度相近, 下方小羽片不延長, 邊緣具開展的明顯鋸齒; 孢子囊群短直, 罕見彎勾狀, 孢膜與孢子囊群同型, 邊緣全緣或具波浪緣; 孢子囊群緊靠羽軸及小羽軸, 每一小羽片多為三對以上, 長度1-2公釐; 孢子黃褐色, 長橢圓形, 表面具可剝落的扁平皺紋, 剝落後下層具顆粒狀凸起.

Endermic in Taiwan, mainly distributed between elevation 1500-2000 m forest understory

台灣特有種, 主要分布在海拔1500-2000公尺森林下方.

Icon. Pl. Form. 4: 217 fig. 148. 1914.

Habitat: Edge of forest or side by the trail, Understory of Forest

Leaf shape: Broad-Lanceolate

Apex of Leaf: Acuminate

Leaf Division: Bipinnatifid

Length of Stipe: 15 (10-25)

Length of Lamina: 25 (15-35)

Width of Lamina: 15 (10-25)

Stipe Color: Purple to Stramineous

Free Pinnulate in basal Pinnae: Yes

Form of basal Pinnulate arrangement: Opposite

Apex of Pinnae: Acuminate

Petioled in pinnae: Short Petiole (less than 3 mm)

Length of Lowest Pinnae: 7 (5-10)

Wideth of Lowest Pinnae: 2.5 (2-4)

Lowest pinnae with enlarged basiscopic pinnules (more than 3 mm): No, less than 3 mm

Apex of terminal fragment: Round or Obtuse

Margin of terminal fragment: Denticulate

Type of Basal of Pinnule: Broadly adnate, Constricted

Anterior pinna or pinnule auriculate: not auricaulate

Lowest Pinnae with shorter basal pinnule: Yes, basal pinnule shorter than next two

Second Lowest Pinnae with shorter basal pinnule: No, Basal Pinnulate similar with next two

Abaxial Surface of Rachis with Unicellular Hairs ?: Yes, densely coved with unicellular hairs (pubescent)

Abaxial Surface of Rachis with Gland Hairs?: Yes, there are rare gland hairs on rachis

Abaxial Surface of Coaste with Unicellular Hairs ?: Yes, densely coverd unicellular hairs on costae (pubescent)

Type of Adaxial Costae Spines: Short spines

Spines Existing on Adaxial Costulate: No, spines Absent on costulate

Type of Scales on Basal Stipe: Lanceolate

Color of Scales on Basal Stipe: Shiny Black

With Adventitious Bud near the Apex of Leave: No, adventitious buds absent

Sori Shape: Short straight, Diplazium type

Sori Position: Closed to midrib

Type of Rhizome: Short Erect

Geographic Distribution: Endermic in Taiwan

Altitude: 1800 (1700-2500)


 

Related Objects Image Gallery 
  • Abaxial View (Liu, Yea-chen)
  • Image/JPEG
  • Athyrium leiopodum (Hayata) Tagawa (Liu, Yea-chen)
  • Image/JPEG

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