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Published In: Journal of the Proceedings of the Linnean Society, Botany (Suppl. 1): 6, 136. 1859. (21 Feb 1859) (J. Proc. Linn. Soc., Bot.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 5/20/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/30/2017)
Plant Category: Moss

Notes     (Last Modified On 10/30/2017)
general taxon notes:

Callicostella contains far fewer than the some 100 species ascribed to this mostly lowland to premontane pantropical genus. About 60 species are presently recorded for the Neotropics, probably 30 or fewer. In Bolivia four species recognized, found in the Amazon and Chiquitano forest to lower montane forest. The genus is characterized by the loosely complanate, ovate, narrowly to broadly oblong-ovate and unbordered leaves, the truncate-apiculate to broadly or narrowly acute apex, the irregularly to regularly serrate margins with teeth often bifid, strong and raised costae that is often toothed, thick-walled, short (1-2:1), smooth to papillose (papillae over lumen or projecting at upper cell angle, or both), rhombic, hexagonal upper laminal cells, smooth or papillose seta, cross-striate, furrowed exostome teeth, and high basal membrane. An older name, Schizomitrium has been employed in recent times by authors, however the name Callicostella in long use, has been conserved. There are additional species based on reports and one species described for Bolivia for which the taxonomic status is unknown (see below). The genus is poorly known and in need of revision in the Neotropics.


Callicostella contiene poco menos de 100 especies adscritas a este género distribuído generalmente desde tierras bajas hasta bosque premontano pantropical. Aproximadamente 60 especies están actualmente registradas en el Neotrópico, probablemente 30 o menos. En Bolivia cuatro especies son reconocidas, se encuentra en el bosque amazónico y Chiquitano hasta el bosque montano inferior. El género se caracteriza por las hojas laxamente complanadas, ovadas, angostamente hasta ampliamente oblongo-ovadas y sin borde, el ápice truncado-apiculado hasta ampliamente o angostamente agudo, los márgenes irregularmente hasta regularmente serrados con dientes a menudo bífidos, costa fuerte y elevada a menudo dentada, células superior de la lámina hexagonales, con paredes gruesas, cortas (1-2:1), lisas hasta papilosas (papilas sobre el lumen o proyectándose en los ángulos superiores de la  célula, o en ambos), rómbicas, setas lisas o papilosas, estrías cruzadas, dientes del exostoma acanalados y membrana basal alta.


Status Unknown:


Callicostella integrifolia (Müll. Hal.) Broth., Nat. Pflanzenfam. 1(3): 938. 1907. Hookeria integrifolia Müll. Hal., Nuovo Giorn. Bot. Ital. n. s. 4: 133. 1897. Type: Bolivia. Prov. Larecaja, Sorata, 1858, Mandon s.n.




Callicostella mosenii (Broth.) Broth. (Hookeria mosenii Broth.).

Callicostella scabriuscula (Müll. Hal.) A. Jaeger (Hookeria scabriuscula Müll. Hal.).

Callicostella strumulosa (Hampe & Lorentz) A. Jaeger (Hookeria strumulosa Hampe & Lorentz).

Callicostella subdepressa (Besch.) Broth. (Hookeria subdepressa Besch.).

Callicostella subsecunda (Mitt.) B. C. Tan (Hookeria subsecunda Mitt.).


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Plants small to medium sized, forming mats, pale to dark green to yellowish or golden. Stems creeping and spreading, somewhat to strongly complanate-foliate; in cross-section lacking a hyalodermis, central strand absent. Leaves differentiated between lateral asymmetric leaves and dorsal/ventral symmetric leaves, the latter somewhat smaller, lateral leaves oblong, ovate- or oblong-short to rather long lanceolate, ligulate, 0.8-2.5 mm long, apex acute, often bluntly so, short acuminate, or truncate-apiculate; margins mostly plane or folded along one side, rarely reflexed below, distally regularly serrulate or dentate, or irregularly sharply serrate, teeth often bifid and swollen, elimbate; costae double, 2/3-4/5 lamina length, rarely extending to apex, mostly strong, usually toothed on back; upper and median cells hexagonal to rhombic, occasionally oblong, smooth to papillose with papillae over cell lumen or projecting at distal cell angle, ± thick-walled; basal cells oblong to rectangular-rounded, occasionally lax, smooth, porose or not. Synoicous, autoicous or dioicous. Perichaetia lateral, leaves strongly differentiated, often narrowly elongate. Setae elongate, 5-20 mm long, slender to rather stout, smooth to papillose or scabrous, distally or throughout. Capsules horizontal to subpendulous, urn ovoid to short cylindrical, 1-2 mm long, short neck, exothecial cells collenchymatous; opercula, conic-long rostrate, oblique.; peristome, double, exostome teeth cross-striate and furrowed, endostome basal membrane high, segments keeled and perforate, lightly papillose. Calyptrae mitrate-campanulate, plicate, scabrous distally, lobed at base. Spores spherical, lightly papillose.


Plantas pequeñas hasta mediaaso, formando matas, verde pálidas hasta oscuras, amarillentas o doradas. Tallos reptantes y patentes, algo hasta marcadamente complanado-foliosos; sin hialodermis en corte transversal, cordón central ausente. Hojas diferenciadas entre hojas laterales asimétricas y hojas dorsal/ventrales simétricas, las últimas algo menores, hojas laterales oblongas, ovado- u oblongas cortas hasta bastante largo-lanceoladas, ligulares, 0.8-2.5 mm de largo, ápices agudos, a menudo obtusamente, corto-acuminados, o truncado-apiculados; márgenes generalmente planos o un lado completamente doblado, rara vez reflexos abajo, regularmente serrulados o dentados en la porción distal, o irregularmente serrados, dientes a menudo bifido y engrosados, elimbados; costa doble, ocupando 2/3-4/5 de la longitud de la lámina, rara vez extendiéndose hasta el ápice, generalmente fuerte, generalmente dentado en el envés; células superiores y mediales hexagonales hasta rómbicas, ocasionalmente oblongas, lisas hasta papilosas con papilas sobre el lumen celular o proyectándose en los ángulos distales de la célula, paredes ± gruesas; células basales oblongas hasta redondeado-rectangulares, ocasionalmente laxas, lisas, porosas o no. Sinoicas, autoicas o dioicas. Periquecios laterales, hojas marcadamente diferenciadas, a menudo angostamente alargadas. Setas alargadas, 5-20 mm de largo, delgadas hasta bastante robustas, lisas hasta papilosas o escabrosas, completamente o en la porción distal. Cápsulas horizontales hasta subpéndulas, urna ovoide hasta corto-cilíndrica, 1-2 mm de largo, cuello corto, células exoteciales colenquimatosas; opérculo, largo cónico-rostrado, oblicuo; peristoma doble, dientes del exostoma con estrías cruzadas y acanalados, membrana basal del endostoma alta, segmentos carinados y perforados, finamente papilosos. Caliptra mitrada-campanulada, plegada, distalmente escabrosa, lobada en la base. Esporas esféricas, finamente papilosas.


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1. Leaf margins irregularly and coarsely toothed … … C. depressa
1. Leaf margins regularly toothed … 2.
2. Leaf costa thick, distally incurved at apex … C. merkelii
2. Leaf costa ± thin to thick, distally spreading to parallel … 3.
3. Leaf apices mostly truncate-apiculate; distal laminal cells papillose; seta papillose or smooth below and distally roughened … C. pallidia
3. Leaf apices mostly short-acute, often bluntly so; distal laminal cells smooth; seta smooth … C. rivularis
1. Márgenes de la hoja irregularmente y gruesamente dentados … C. depressa
1. Márgenes de la hoja regularmente dentados … 2.
2. Hojas con costa gruesa, distalmente incurvada en el ápice … C. merkelii
2. Hojas con costa ± delgada a gruesa, distalmente patente a paralela … 3.
3. Hojas con ápice generalmente truncado-apiculado; células distales de la lámina papilosas; setas papilosas o lisas abajo y distalmente rugosas … C. pallidia
3. Hojas con ápice generalmente corto-agudo, a menudo obtusamente; células distales de la lámina lisas; setas lisas … C. rivularis
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