A new Podostemacea from Thailand, Polypleurella micranthera

Herba nana, basi lichenoidea; individua foliata parvula folia 3 vel 4 naviculiformia, apice obtusa gerentia. Flores terminales, a spathella membranacea inclusa, pedicellis brevibus. Tepala dua, staminis basi in utraque latere posita, oblanceolata, apice acuta. Stamen unum, filamentis linearibus; antherae dorsifixae, ovoideae, apice obtusae, basi incisae, 2-loculares, rimis dua longitudinalibus lateraliter dehiscens; grana pollinis 2-locularia. Ovarium ellipsoideum, compressum, apice acutum, basi decurrens, 12-costatum, costus suturalibus longitudinaliter dimidiatis, 2-locularem septis caducis, placenta centrali, ovulis paucis; styli 2, ovato-lanceolati, basi coherentes, papillati. Capsula ovario exacte similis vel eo paullum maior, septicide, seminibus oblongo-obovoideis. Thalloid base up to 7 cm in diam. Shoots suberect, 1—1.5 mm long. Leaves c. 0.7 by 0.5 mm. Spathella rupturing at apex with a few irregular lobes, pedicels c. 0.5 cm long. Tepals oblanceolate, 2—2.5 mm long, one-nerved, acute. Stamen 1, inserted at side of ovary directed to the thalloid base, 4—5 mm long, filaments linear, 3.5—4.5 mm long, anther ovoid, c. 0.5 mm long, apex obtuse or truncate, deeply cleft at base. Ovary 1.5—2 by c. 1 mm, acute at apex, with 12 distinct nerves of which the two sutural ones divide later longitudinally, originally 2-celled, but septae soon disappearing. Styles c. 0.5 mm long. Capsule as large as ovary or slightly larger