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Athyriaceae | Family List | Athyriaceae | Athyrium

Athyrium iseanum Rosens in Fedde, Repert. Sp. Nov. 13. 124. 1913.


Athyrium iseanum

Credit: Yea-chen Liu

Rhizome ascending. Stipes stramineous, tufted, 15-30 cm long, scaly near base; scales thin, brown, lanceolate; lamina ovate, trupinnatifid, 20-30 cm long, 12-15 cm wide; texture herbaceous; pinnae somewhat ascending, acuminate, often acudate, 5-10 cm long, 25-35 cm wide, petiolate, basal pair of pinna usually slightly shorted; pinnuiles petiolate, anadromous, flandular pubescent n upper surface along rachis and rachillae; prominent spine-like processes borne on upper surface along rachis and costae. Indusia broad, brown erose; ;inear, curved, J-shaped or reniform, often crossing veinlets.

Taiwan, China, Japan.

Habitat: Understory of Forest

Leaf shape: Deltoid

Apex of Leaf: Acuminate

Leaf Division: Tripinnatifid

Length of Stipe: 10 (5-30)

Length of Lamina: 20 (15-40)

Width of Lamina: 25 (15-30)

Stipe Color: Stramineous

Free Pinnulate in basal Pinnae: Yes

Form of basal Pinnulate arrangement: Opposite

Apex of Pinnae: Acuminate

Petioled in pinnae: Obvious Petiole (more than 3 mm)

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

Apex of terminal fragment: Acute

Margin of terminal fragment: Serrulate

Type of Basal of Pinnule: Petiolulate

Anterior pinna or pinnule auriculate: not auricaulate

Lowest Pinnae with shorter basal pinnule: No, basal pinnule similar with next two pinnules

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

Abaxial Surface of Rachis with Unicellular Hairs ?: No, glabrous

Abaxial Surface of Rachis with Gland Hairs?: No, there is no gland hairs on it

Abaxial Surface of Coaste with Unicellular Hairs ?: No, there is no unicellular hairs on costae (glabrous)

Type of Adaxial Costae Spines: Long-soft spines

Spines Existing on Adaxial Costulate: Yes, spines Existing on costulate

Type of Scales on Basal Stipe: Ovate

Color of Scales on Basal Stipe: Yellow Brown

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

Sori Shape: Short straight

Sori Position: Closed to midrib

Type of Rhizome: Short Erect

Geographic Distribution: Taiwan - Himalaya, Taiwan - Japan

Altitude: 2000 (1700-2500)


Related Objects  
  • Image/JPEG (Yea-chen Liu)
  • Image/JPEG

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