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Published In: Bihang till Kongliga Svenska Vetenskaps-Akademiens Handlingar 6(19): 22. 1882. (Mar–Aug 1882) (Bih. Kongl. Svenska Vetensk.-Akad. Handl.) Name publication detailView in Biodiversity Heritage Library

Project Name Data (Last Modified On 1/26/2013)
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Notes     (Last Modified On 2/5/2013)
Aloina contains six species in the Neotropics; 12 species of rather wide distribution. On soil and soil covered rocks, exposed to partially shaded in dry sites; plains at lower elevations to high open montane, páramo and puna, to 4570 m. Distinguishing features include the half or more buried plants, strongly folded distal margins that cover the ventral costal filaments, and medially bistratose lamina. Several Aloina species are concentrated within both Mexico and the Central Andes as well as being widely distributed outside the Neotropics, e.g., A. rigida (Hedw.) Limpr.; other species however are restricted in their distribution: A. apiculata (E.B. Bartram) Delgad. from Jamaica, and from the central Andes A. catillum (Müll. Hal.) Broth. and A. roseae (R.S. Williams) Delgad. The generic name refers to liliaceous genus Aloë with its fleshy leaves. Keys adapted from Cano et al. (2008).
Aloina contiene seis especie en el Neotrópico; 12 especies de distribución bastante amplia. Las características que ayudan a distinguir este género son las plantas enterradas hasta la mitad o más, márgenes distales marcadamente doblados cubriendo los filamentos ventrales de la costa y lámina biestratificada en la región media. El nombre genérico refiere al género liliaceo Aloë que presenta hojas carnosas.


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Plants very small, gregarious or forming thin tufts, dark green to brown above. Stems erect, but often buried in soil with only tips exposed, 2-6 mm tall, simple or few branched; in cross-section hyalodermis absent, epidermal wall somewhat thickened, inner cells rather uniform, thin-walled, central strand present or absent; radiculose below, beneath soil, rhizoids pale. Leaves appressed-incurved when dry, slightly spreading when wet, ovate-lingulate or short lingulate, 0.5-2.5 mm long, often deeply channeled, apex obtuse to rounded, cucullate, piliferous or not, base subauriculate, sheathing; margins strongly enfolded, entire or distally crenulate or denticulate; costa undifferentiated or single, percurrent to rather long excurrent, superficial cells ventrally represented in distal half by photosynthetic filaments extending beyond costal region, mostly 4-8 cells high, terminal cell distally thickened, dorsally long rectangular or distally short rectangular or quadrate, in cross-section broadly reniform, stereids below guide cells, dorsal epidermis weakly differentiated, guide cells 6-12 in 1(-2) layer; lamina partially bistratose; upper cells transversely oblong-rectangular or elliptical, thick-walled; basal cells rectangular, thin-walled. KOH leaf color reaction red. Dioicous or autoicous. Perichaetia terminal; leaves mostly similar, margins plane, not enfolded. Setae elongate, 6-20 mm long, twisted, smooth. Capsules erect, urn cylindrical or ovoid-cylindrical, 1-3 mm long; exothecial cells rectangular, thin-walled; stomata at urn base, superficial; annulus 1-3 rows, revoluble to persistent; opercula long conic or rostrate, erect to slightly oblique; peristome single, basal membrane absent or present, low to high, teeth 16, straight to twisted, variously divided, spiculose. Calyptrae cucullate, smooth and naked. Spores spherical, finely to coarsely papillose.
Plantas muy pequeñas, gregarias o formando manojos delgados, verde oscuras hasta pardas arriba. Tallos erectos, pero a menudo enterrados en el suelo sólo con los extremos expuestos, 2-6 mm de alto, simples o poco ramificados; en corte transversal hialodermis ausente, pared epidérmica algo engrosada, células internas bastante uniformes, con paredes delgadas, cordón central presente o ausente; radiculosos en la porción inferior, debajo el suelo, rizoides pálidos. Hojas adpreso-incurvadas en seco, escasamente patentes en húmedo, ovado-liguladas o corto-lingüiformes, 0.5-2.5 mm de largo, a menudo profundamente acanaladas, ápices obtusos hasta redondeados, cuculadas, pilíferas o no, bases subauriculadas, envainadoras; márgenes marcadamente doblados, enteros o distalmente crenulados o denticulados; costa indiferenciada o simple, percurrente hasta bastante largo-excurrente, células superficiales ventralmente representadas en la mitad distal por filamentos fotosintéticos extendiéndose más allá de la región costal, generalmente 4-8 células de alto, célula terminal distalmente engrosada, dorsalmente largo-rectangulares, distalmente corto-rectangulares o cuadradas, en corte transversal ampliamente reniformes, estereidas debajo las células guía, epidermis dorsal débilmente diferenciada, células guía 6-12 en 1(-2) capas; lámina parcialmente biestratificada; células superiores transversalmente oblongo-rectangulares o elípticas, con paredes gruesas; células basales rectangulares, con paredes delgadas. La hoja se torna roja en la reacción con KOH. Dioicas o autoicas. Periquecios terminales; hojas generalmente similares, márgenes planos, no doblados. Setas alargadas, 6-20 mm de largo, torcidas, lisas. Cápsulas erectas, urna cilíndrica u ovoide-cilíndrica, 1-3 mm de largo; células exoteciales rectangulares, con paredes delgadas; estomas superficiales en la base de la urna; anillo en 1-3 filas, revolubles hasta persistentes; opérculo largo- cónico o rostrado, erectos hasta escasamente oblicuos; peristoma simple, membrana basal ausente o presente, baja hasta alta, con 16 dientes, rectos hasta torcidos, diversamente partidos, espiculados. Caliptra cuculada, lisa y desnuda. Esporas esféricas, finamente hasta gruesamente papilosas.

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1. Leaf apex with a hyaline hair-point; marginal cells at leaf base undifferentiated … 2.
1. Leaf apex muticous or mucronate; marginal cells at leaf base differentiated … 3.
2. Leaf costa undifferentiated or with 1 stereid layer; only known in South America from Chile, but likely to be found in northwest Argentina and Bolivia … A. bifrons
2. Leaf costa differentiated, with 2-3 stereid layers … A. roseae
3. Leaf costa excurrent into a mucro; leaves ovate to ovate-lanceolate … A. obliquifolia
3. Leaf costa percurrent or ending below the apex; leaves ligulate, lingulate or suborbicular … 4.
4. Leaves suborbicular to short-lingulate; costa with 1-3 stereid or substereid layers; seta twisted to the left throughout; peristome basal membrane with 1-2 rows of cells … A. catillum
4. Leaves lingulate to ligulate; costa with 3-6 stereid layers; seta twisted to the right in upper part and slightly to the left below; peristome basal membrane with 3-4 rows of cells … A. rigida
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