1. Athyriaceae (蹄盖蕨科)
2. Rhachidosorus (轴果蕨属)
3. Rhachidosorus truncatus (云贵轴果蕨)

1. ATHYRIACEAE (蹄盖蕨科)
2. Rhachidosorus
3. Rhachidosorus truncatus (云贵轴果蕨)

1. Athyriaceae (蹄盖蕨科)
2. Rhachidosorus
3. Rhachidosorus truncatus (云贵轴果蕨)

1. Rhachidosoridaceae
2. Rhachidosorus
3. Rhachidosorus truncatus

1. Rhachidosoraceae
2. Rhachidosorus
3. Rhachidosorus truncatus

1. Rhachidosoraceae
2. Rhachidosorus
3. Rhachidosorus truncatus (云贵轴果蕨)

1. Athyriaceae (蹄盖蕨科)
2. Rhachidosorus (轴果蕨属)
3. Rhachidosorus truncatus (云贵轴果蕨)

1. Rhachidosoraceae
2. Rhachidosorus
3. Rhachidosorus truncatus

Rhachidosorus subfragilis Ching.

Rhizome erect; fronds caespitose. Fertile frond up to 1.6 m; stipe castaneous-brown at base, upward stramineous, shiny, up to 70 cm, base with dense brown lanceolate scales, upward glabrous; lamina 2- or 3-pinnate with pinnules or secondary pinnules pinnatilobate, deltoid, up to 1 m × 80 cm, glabrous, acuminate at apex; pinnae up to 20 pairs, all stalked, stalk of lower pinnae ca. 2 cm, slightly ascending, basal 2 pairs of pinnae largest, broadly lanceolate or narrowly elliptic-lanceolate, up to 40 ´ 14 cm, base ± symmetrical, apex acuminate, shortly caudate; upper pinnae lanceolate; pinnules up to 15 pairs, alternate, spreading, up to 10 ´ 3 cm, with stalk ca. 4 mm, narrowly winged, pinnules on basiscopic side longer than acroscopic, apex shortly acuminate to rounded; pinnule lobes up to ca. 10 pairs, oblong or ovate, up to 15 × 8 mm, pinnatilobate to pinnatifid with 4 or fewer lobes, apex rounded or truncate and entire or slightly repand. Veins prominent on abaxial side, pinnate, veinlets 1 or 2 pairs in ultimate lobes, mostly simple, occasionally forked. Lamina green abaxially, usually brown adaxially, herbaceous when dry, rachis and costae pale stramineous, shiny. Sori and indusia lunate, usually 1 per lobe, costular. Perispore with dense irregular warty ornamentation.

Under bushes, calcareous rock crevices; 600-1500 m. Guangxi (Napo), Guizhou (Anlong, Ceheng, Libo), Yunnan (Maguan, Malipo, Xichou).

2. 云贵轴果蕨（贵州科学）贵州轴果蕨（植物分类学报）云南轴果蕨（植物分类学报）图版63: 1-3

Rhachidosorus truncatus Ching in Acta Phytotax. Sin. 9 (1): 75. 1964; Y. L. Chang et al., Sporae Pterid. Sin. 240, t. 47, f. 30-31. 1976. ——Rhchidosorus subfragilis Ching, l. c. 9 (1): 76. 1964; Y. L. Chang et al., Sporae Pterid. Sin. 239, t. 47, f. 28-29. 1976.

根状茎直立；叶簇生。能育叶长达1.6米；叶柄长达70厘米，基部栗褐色，密被褐色披针形鳞片，向上为禾秆色，光滑，有光泽；叶片光滑无毛，长达1米，宽达80厘米，三角形，先端渐尖，下部二至三回羽状一小羽片或末回小羽片羽裂；羽片可达20对，均有柄，下部的柄长达2厘米，略斜向上，基部两对最大，阔披针形或长椭圆披针形，长达40厘米，宽达14厘米，一回羽状一小羽片二回羽裂，或基部二回羽状，两侧近对称，先端渐尖，并有短尾头，其余羽片与基部羽片形态相似，向上渐短小，上端羽片披针形，一回羽状一羽片羽裂，或为二回羽裂；一回小羽片达15对，互生，平展或略向上斜展，下部的形态与靠近叶片先端的羽片形态相似，长达10厘米，宽达3厘米，基部有长达4毫米并具狭翅的小羽柄，通常下侧的略长，上部的柄渐缩短，先端短渐尖至钝圆；一回裂片在下部羽片的小羽片上达10对左右，长方形或卵形，长达1.5厘米，宽达8毫米，先端钝圆或平截，全缘或略呈波状，两侧羽状浅裂至深半裂，末回裂片达4对，偶见下部羽片的小羽片基部有1对二回小羽片，其形态与一回裂片相似。叶脉下面明显，在裂片上羽状小脉1-2对，大多单一，偶有分叉。叶干后草质，上面常呈褐绿色，下面绿色，叶轴及羽轴淡禾秆色，有光泽。孢子囊群及囊群盖新月形，通常每裂片1枚，紧靠末回小羽片或裂片主脉，排成整齐的两行，斜向上，囊群盖成熟时灰褐色。孢子周壁表面具较密的不规则疣状纹饰。

分布于广西西部（那坡）、贵州南部（荔波、册亨、安龙）、云南东南部（西畴、麻栗坡、马关）。生于石灰岩丘陵灌丛阴湿处岩隙，海拔650-1500米，常见。模式标本采自贵州（册亨）。

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