Tropicos | Name - Acroporium Mitt.

Andean Bryo > Sematophyllaceae > Acroporium

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Acroporium Mitt.

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Project Name Data (Last Modified On 8/23/2009)

Acceptance : Accepted

Project Data (Last Modified On 11/15/2012)

General Reference:

Buck, W. R. & A. Schäfer-Verwimp. 1991 [1993]. A reassessment of Schraderobryum (Sematophyllaceae). Bol. Mus. Paraense "Emílio Goeldi", n.s., Bot. 7(2): 645–654.

Notes (Last Modified On 11/15/2012)

Notes:

Acroporium contains some 80 species primarily of the Paleotropics; about 3-4 species in the Neotropics; in the tropical Andes three species. Acroporium is distinguished by the tufted habit formed by ascending stems and branches, the deeply concave, usually distally tubulose leaves, strongly obliquely arranged, inflated, thick-walled, oblong alar cells, and exostome furrowed or not. Most species assigned to Acroporium were originally placed in Sematophyllum.

Acroporium contiene unas 80 especies principalmente del Paleotrópico; ca. 3-4 especie en el Neotrópico; en los Andes tropicales tres especies. Acroporium se distingue por su hábito fasciculado formado por tallos y ramas ascendentes, las hojas profundamente cóncavas, por lo general distalmente tubulosas, marcadamente dispuestas oblicuamente, inflado, pared celular gruesa, oblongas alar células, y exostoma acanalado o no. La mayoría de las especies asignadas a Acroporium estaban localizadas originalmente en Sematophyllum.

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Plants usually forming tufts, glossy green, yellowish-green or golden. Stems initially short creeping then ascending to erect; central strand absent. Leaves erect to erect-spreading, narrowly to broadly ovate to oblong-lanceolate, concave, apex long acuminate, base usually somewhat auriculate; margins distally enrolled, entire to slightly serrulate; laminal cells smooth (rarely unipapillose) upper and median cells linear, porose or not; basal cells shorter, strongly porose; alar cells differentiated, obliquely angled (45°), oblong-rectangular, inflated, thick-walled, usually golden-yellow or -brown. Autoicous. Perichaetia lateral. Setae elongate, slender and wiry. Capsules inclined to erect, urn ovoid, mouth flared when deoperculate; exothecial cells collenchymatous; stomata at urn base, superficial; opercula long-rostrate, oblique; peristome double, exostome finely cross-striate, distally papillose, weakly to strongly furrowed; endostome basal membrane high, segments 16, keeled and perforate. Calyptrae cucullate, smooth and naked. Spores spherical, lightly to densely papillose.

Plantas generalmente formando manojos, verdes brillantes, verde-amarillentas o doradas. Tallos inicialmente corto reptantes luego ascendentes a erectos; sin cordón central. Hojas erectas a erecto-extendidas, angostamente a anchamente ovadas a oblongo-lanceoladas, cóncavas, ápices largo acuminados, base generalmente algo auriculada; márgenes distalmente enrollados, enteros a escasamente serrulados; células de la lámina lisas (rara vez unipapilosas) células superiores y medias lineales, poroso o no; células basal cortas, marcadamente porosas; células alares diferenciadas, acomodadas oblicuamente en ángulo (45°), oblongo-rectangulares, infladas, con paredes gruesas, generalmente amarillo-doradas o -marrones. Autoicas. Periquecios laterales. Setas alargadas, delgadas y alambrinas. Cápsulas inclinadas a erectas, urna ovoide, boca {flared} cuando está desoperculadas; células exoteciales colenquimatosas, estomas en la base de la urna, superficiales; opérculo largo-rostrado, oblicuo; peristoma doble, exostoma con estrías finamente cruzadas, distalmente papiloso, débilmente a marcadamente acanalado; membrana basal del endostoma alta, segmentos 16, carinados y perforados. Caliptra cuculada, lisa y desnuda. Esporas esféricas, ligera a densamente papilosas.