Hoya soidaoensis Kidyoo

A small climbing epiphyte. Leaves elliptic, thick coriaceous, entire, occasionally faintly recurved; adaxial surface rough with scattered hairs; apex acute, base cuneate to acute. Inflorescences extra-axiliary, slightly concave in top view, 5–12–flowered; flower buds pentagonal shaped with reddish brown acuminate apex. Calyx greenish to reddish brown, lobes 5, nearly divided, ovate, apex acute. Corolla rotate, creamy to yellowish white, adaxial surface with densely long straight hair along the margin of the lobes; lobes reflexed, revolute, ovate, apex acuminate. Corona creamy to pinkish white. Pollinia obliquely oblong, yellow, apex truncate. Pistil 2-ovaries, glabrous. Follicles linear-lanceolate in outline, pale green with scattered reddish brown spots.

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Hoya thailandica Thaithong

Stragging climber. Leaves subcoriaceous, oval, ovate or elliptic, base rounded, apex shortly acuminate, upper surface shining. Inflorescence axillary, pendent, Flowers 10-15 in sub-hemisphaerical umbel. Calyx pale green, sepals boat-shaped, margin finely ciliate, glands 5, alternating with sepals. Corolla white, rotate-campanulate, about 2 cm diam. when fully spread out, lobes ovate as long as corolla tube, apex abruptly acuminate. Corona more or less horizontal, reddish-purple. Pollinia obliquely oblong. Stigma conical, subquadrangular.

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Hypodematium boonkerdii Pongkai, Li Bing Zhang & Pollawatn

Plants lithophytic. Stems creeping, densely covered with scales; Scales linear lanceolate, concolorous, reddish brown, denticulate at margin near apex. Leaves monomorphic, bipinnate-tripinnatifid; covered with long-unicellular hairs on both surfaces, scaly at base. Laminae deltoid in outline, hairy, membranous; pinnae 10‒14 pairs, lower pairs opposite, upper pairs alternate, gradually becoming smaller upward; pinnule 6‒10 pairs, alternate, narrowly oblong, apex acute, margin lobe about ¾ way to costule, sessile. Sori small, reniform to round, black, on basal acroscopic veinlet of each vein group of lobe; indusia round-reniform, thin, persistence, sparsely hairy, light green; spores monolete, kidney-shaped.

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Ischaemum thomasii Traiperm & Boonkerd

Perennial, stoloniferous. Culms erect, sometimes prostrate, slender. Leaf-sheaths loose, glabrous, margin thin and pilose. Ligules completely divided into two lobes, oblong, apex round. Leaf-blades pubescent, recurved, margin folded. Inflorescences comprising two terminal racemes, usually appressed back to back. Sessile spikelet: lower glume oblong, pilose on the back; upper glume boat-shaped, keeled along the back. Pedicelled spikelet: pedicel clavate, pilose along keel. Glumes: lower glume oblong-ovate, with 2 subequal wings along margins, upper glume boat-shaped, pilose on the back, margin ciliate.

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Microsorum siamensis T. Boonkerd

Rhizome slender, short-creeping. Scales densely set, slightly spreading, widest near the base, ovate or triangular, peltate, margin denticulate, apex acuminate to caudate, clathrate throughout. Frond monomorphous, iridescent blue-green in colour when living, havana brown to raw umber in dry specimens. Lamina simple, hydathodes scattered on upper surface, elliptic to narrowly elliptic. Sori seperate, usually occupying the upper half portion of the lamina, more or less round, superficial; paraphysis absent; sporangium hyaline when young, turning yellowish-brown when mature; spores concavo-convex, brightly golden yellow.

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Microsorum thailandicum Boonkerd & Noot.

Rhizome short creeping, not white waxy. Scales densely set, slightly spreading, widest near the base, ovate or triangular, the margin denticulate, apex acuminate to slightly caudate, clathrate throughout, dark black on central region. Fronds monomorphous, subcoriaceous, iridescent blue in color when living, linoleum brown in dry specimens. Lamina simple, narrowly elliptic, apex long acuminate, base attenuate, the stipe more or less winged, margin entire. Sori separate, mostly irregularly scattered on simple free veins or on 2-3 connective veins, usually occupying the apical half of the lamina, more or less round, slightly immersed; sporangium hyaline when young, turning black when mature; spores concavo-convex, yellowish hyaline.

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