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Published In: Revue Bryologique 40(2): 17. 1913. (Rev. Bryol.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 3/23/2009)
Acceptance : Accepted
Project Data     (Last Modified On 10/30/2017)
Plant Category: Moss

Notes     (Last Modified On 10/30/2017)
general taxon notes:
Pireella contains about 15 species confined to the Neotropics (Newton 1993). The genus is characterized by the frondose, rarely simple, habit, the smooth to weakly porose, oblong-linear to oval upper laminal cells, and few to several subquadrate alar cells. Taxonomic concept based on the revision by Newton (1993). The name Pireella cavifolia (Cardot & Herzog) Arzeni of recent authors is Porotrichodendron lindigii (Hampe) W. R. Buck, now placed in the Neckeraceae.
Pireella contiene aprox. 15 especies confinadas al Neotrópico (Newton 1993). En Bolivia dos especies han sido registradas. El género se caracteriza por el hábito frondoso, rara vez simple, las células superior de la lámina lisas a débilmente porosas, oblongo-lineales a ovales y pocas a varias células alares subcuadradas.
Newton, A. E. 1993. Phylogenetic systematics of the tropical moss genus Pireella (Pterobryaceae: Musci). Ph. D. dissertation. Duke University, Durham.


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Plants often forming loose or dense turfs, olive to dark green. Primary stems creeping, leaves scale like, lanceolate, long acuminate; rhizoid clustered beneath. Secondary stems solitary to more commonly frondose from a distinct stipe, stipe leaves appressed to loosely erect; in cross-section outer 3-5 rows of cells small, thick-walled, inner cells larger, progressively thin-walled, central strand absent. Secondary stem and branch leaves oblong- or ovate-lanceolate, concave, apex mostly abruptly acuminate, base weakly to strongly auriculate or rounded; margins serrulate usually throughout or entire, costae percurrent to subpercurrent; median cells oval to oblong-linear, appearing smooth or weakly papillose by projecting distal cell angles; alar region usually differentiated, cells few to several, subquadrate. Dioicous. Perichaetia lateral. Setae elongate, smooth or distally roughened. Capsules immersed to long excerted, erect to suberect, urn ovoid to ovoid-cylindrical; opercula long rostrate; prostome often present, peristome single or double and reduced, exostome often appearing to form 8pairs of teeth, smooth or roughened distally; endostome often absent or adhering to back of exostome. Calyptrae mitrate or cucullate, sparsely hairy. Spores spherical, granulate.
Plantas a menudo formando céspedes laxos o densos, verde oliva hasta verde oscuras. Tallos primarios reptantes, hojas similares a escamas, lanceoladas, largo-acuminadas; rizoides agregado en la porción inferior. Tallos secundarios solitarios a más comúnmente frondosos desde un estípite conspicuo, hojas del estípite adpresas a laxamente erectas; en corte transversal 3-5 filas externas de células pequeñas con paredes gruesas, células internas mayores, con paredes progresivamente delgadas, banda central ausente. Hojas de los tallos secundarios y ramas oblongo- u ovado-lanceoladas, cóncavas, ápices por lo general abruptamente acuminados, bases débilmente a marcadamente auriculadas o redondeadas; márgenes serrulados generalmente por completo o enteros, costa percurrente hasta subpercurrente; células mediales ovales hasta oblongo-lineares, de apariencia lisa o débilmente papilosa por los ángulos distales de las células; región alar generalmente diferenciada, pocas a varias células, subcuadradas. Dioicas. Periquecios laterales. Setas alargadas, lisas o distalmente rugosas. Cápsulas inmersas hasta largo-excertas, erectas hasta suberectas, urna ovoide hasta ovoide-cilíndrica; opérculo largo-rostrado; prostoma a menudo presente, peristoma simple o doble y reducido, exostoma a menudo aparentemente formando 8 pares de dientes, distalmente lisos o rugosos; endostoma a menudo ausente o adherido a la región posterior del exostoma. Caliptra mitrada o cuculada, escasamente pelosa. Esporas esféricas, granuladas.

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1. Stipe leaves squarrose spreading; branch leaf costa extending to middle or upper third of leaf, vanishing well below apex; premontane forest … P. trichomanoides
1. Stipe leaves erect, appressed to the stem; branch leaf costa extending to near leaf apex; widespread in lowlands, extending into the premontane … P. pohlii
1. Hojas del estípite escuarrosas patentes; hojas de las ramas con la costa extendiéndose hasta la mitad o el tercio superior de la hoja, desapareciendo bien abajo del ápice; bosque premontano … P. trichomanoides
1. Hojas del estípite erectas, adpresas al tallo; hojas de las ramas con la costa extendiéndose hasta cerca del ápice; amplia distribución en tierras bajas, extendiéndose en el premontano … P. pohlii
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