Angiopteris sparsisora Ching, sp. nov.—a putative bigeneric hybrid

Abstract

Abstract:

Angiopteris sparsisora Ching, sp. nov.

Species nova ab omnibus affinibus adhuc cognitis recedit rhizomate repente, dorsi-

ventrali, habitu minore stipite tenui, levi, paleis brunneis lineari-lanceolatis margine

irregulariter fimbriatis peltati-fixis, pinnulis basi cuneatis vel late cuneatis, distincte

breviterque petiolulatis, soris longitudine variis, inter se separatis a margine magis re-

motis, paraphysibus rudimentalibus brevibus sparse praesentibus.

Tota planta 1—1.2 m alata, rhizomate repente, carnoso, cylindrico, dorsiventrali, 5—

6 cm diametro, radicoso, apice frondes 2—3 emittente, stipite 35—70 cm longo, 4—8 mm

crasso, levi viridi, supra medium uni-geniculato (in frondibus pinnatis usque subbipin-

natis), paleis brunneis lineari-lanceolatis basi rotunda peltati-fixis margine varie fimb-

riatis sparse vestito; lamina stipite longiore, bipinnata aut subb ipinnata raro superne

simpliciter pinnata; pinnis 2—3(—7)-jugis, ,alternis vel suboppositis, oblongis, 45—

55 cm longis, 18—23 cm latis, petiolo 4—16 cm longo suffultis, basi tumidis, pinnatis vel

interdum simplicibus vel basi pinnatifidis; pinnulis plerumque 8—12-jugis, alternis vel

suboppositis, patentibus, 8—18 cm longis, medio 1.5—3cm latis, lanceolatis, acuminatis,

basin versus cuneatis vel late cuneatis, breviter petiolatis, pinnula terminali confomi

paulo majore, petiolulata, hasi baud in alas decurrente, margine serrulatis; venis utrin-

quo distinctis, patentibus, simplicibus vel furcatis, prope marginem curvatis; pagina

frondis textura in sicco virescente, chartacea, rachi, costis, costulis venisque subtus

sparsim minuteque paleaceis. Soris breviter linearibus, 2—4 mm longis, 10—32-spo-

rangiatis, inter se separatis, a margine 2—3 mm, remotis; paraphysibus sparsis brevibusrudimentalibus. Sporis globulosis, suparficie dense tubuculatis.

Yunnan austro-orientalis: Xichou Xian, Fadou, S. K. Wu 4203 (typus, PE), 4198,

8, October, 1962; ibidem, Z. R. Wang 566-1, 566-2, 566-3, 566-4, 566-5, 15, January,

1978; ibidem V. M. Chu 8212, 15, January, 1978. in valley under evergreen broad-

leaved forests, alt. 1500—1550m.

In the tropical rain forest in southeastern Yunnan, China, the members of Angiopte-

ris Hoffm. and Archangiopteris Christ et Gies. are often growing side by side in great

abundance. In January 1978 the second writer made a botantical trip there and col-

lected in one locality ample herbarium material of an Angiopteris, which is identical

with A. sparsisora Ching (ined.), based upon type specimens gathered by Mr. S. K. Wu

from the same locality in 1962. To our great surprise, however, this distinct taxon

reveals a number of important morphological characteristics intermediate between An-

giopteris and Archangiopteris as diagnosed above.

The present species resembles Archangiopteris in small build with creeping dorsi-

ventral rhizome, unigeniculate, thin, smooth stipe in pinnate to bipinnatifid fronds, spa-

ringly clad in linear-lanceolate peltately affixed scales with variously fimbriate margin,

lamina 1—2 pinnate or subbipinnate, pinnules distinctly and shortly stipitate, base

cuneate or broadly cuneate, sori of different length separated from each other by broad

spaces, and rather far away (2—3 mm) from the margin, paraphyses few, rudimentary

and short, but, on the other hand, it also similar to Angiopteris in usually bipinnate

fronds, the petiole of pinnae with swollen base (blackish upon drying), short (2—4 mm

long) linear sori consisting of 5—16 pairs of sporangia and globulax spores with densely

tubucular sporoderms. All the above characteristics combined clearly indicate the spe-

cies is in all likelihood a natural hybrid between Angiopteris and Archangiopteris,

pending cytological investigation and the reason for presently placing it in Angiopteris

rather than in Archangiopteris is because of the fact that in overall impression the new

taxon appears more like the former than the latter.

Ching Ren-Chang, Wang Zhong-Ren. Angiopteris sparsisora Ching, sp. nov.—a putative bigeneric hybrid[J]. .

Angiopteris sparsisora Ching, sp. nov.—a putative bigeneric hybrid

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