Bol. Soc. Argent. Bot. 55 (4) 2020
S. Jimenez & N. Niveiro 104, (CTES, LIL). 6. Pseudocrossidium arenicola (Dusén) M.J. Cano
Cortícola en la base de Fabaceae, al costado del [Pottiaceae]
sendero, abundante, soleado y seco, 01/03/2011,
S. Jimenez & N. Niveiro 105a, 107, 110, (CTES,
Specimens examined. ARGENTINA. Santiago
LIL). 25°51´15,5´´S 61° 42´ 45,9´´W; 140 m, del Estero. Depto. La Banda, Dique “Los
cortícola, escaso, en el interior del monte, escaso, Quiroga”, 27° 39’ 59.22’’S 64° 22’ 00.38’’W;
seco y sombrío, S. Jimenez & N. Niveiro 113, 116, 204 m, 30/09/2003, G. Suárez 291, 293 (CTES,
(
CTES, LIL). 25° 49´ 07,8´´S 61° 42´40,8´´ W; 165 LIL). Depto. Pellegrini, Quebracho Coto, Ruta
m, cortícola en la base de Fabaceae, seco y soleado, provincial 37, cerca del río Urueña, 26.2°S 64.4’W;
S. Jimenez & N. Niveiro 117 (CTES, LIL). 208 m, 10/03/2008, G. Suárez 1027b, 1032b,
CTES, LIL). Depto. Copo, Parque Nacional
(
Distribution and habitat. It is known from Copo, 25º51´15.6´´S 61º42´45.10´´W; 158 m,
North, Central and South America, Europe, eastern terrícola en suelo arcilloso y seco, formando
Asia, Pacific Islands, and Australia (Caners, 2017). importantes montículos, rodeado de Selaginella
In Argentina it was previously recorded from sp., muy abundante, 01/03/2011, S. Jimenez & N.
Buenos Aires, Chaco, Corrientes, Formosa, Jujuy, Niveiro 109 (CTES, LIL).
Misiones, Salta, Santa Cruz, Tucumán (Matteri,
2
003).
Distribution and habitat. It is a South American
species recorded from Argentina and Bolivia.
Comments. This is a very delicate plant with In Argentina, it was previously recorded from
stems readily breaking when leaves are removed Buenos Aires, Catamarca, Chubut, Jujuy, Salta,
during dissecting. The species is corticulous and Tucumán (Cano et al., 2016). This species grows
grows forming lax and wide mats on bark of tree on soil and forms dense turfs.
trunks and bases.
Comments. Diagnostic characters include
5
. Macrocoma tenuis subsp. sullivantii (Müll. ligulate leaves, margin recurved, apex rounded-
Hal.) Vitt [Orthotrichaceae Arn.]
obtuse below the awn, costa in transverse section
with a single stereid band and leaf ending in an
Specimen examined. ARGENTINA. Santiago awn (Cano et al., 2009).
del Estero. Depto. Copo, Parque Nacional Copo,
2
5°51´15,5´´S 61°42´45,9´´W; 158 m, cortícola, 7. Pseudocrossidium linearifolium (Müll. Hal.)
escaso, en arbolito en el interior del monte, seco y J.A. Jiménez & M.J. Cano [Pottiaceae]
sombrío, 01/03/2011, S. Jimenez & N. Niveiro 114
(
CTES, LIL).
Specimens examined. ARGENTINA. Santiago
del Estero. Depto. Copo, Parque Nacional Copo,
Distribution and habitat. This subspecies 22º55´18´´S 61º42´45.22´´W; 158 m, cortícola en
has been recorded in North and South America la base de un arbolito, 01/03/2011, S. Jimenez &
Churchill & Linares, 1995; Matteri, 2003; Valente N. Niveiro 111b (CTES, LIL). Depto. Pellegrini,
(
et al., 2020) and Asia (Readfern et al., 1986). In Ruta Provincial 37, cerca del rio Urueña, 26°S
Argentina, this taxon has been previously recorded 64°W; 208 m, 10/03/2008, G. Suárez 1035 (CTES,
(
as Macrocoma “tenue” spp. sullivantii (Müll. LIL).
Hal.) Vitt) from Corrientes (Matteri, 2003).
Distribution and habitat. It is a South American
Comments. This species is distinguished by species found in Argentina, Bolivia, and Ecuador.
the brown to olive-green color of the plants with In Argentina, it has previously been recorded
light-green younger tips, leaves erect-appressed from Córdoba, Salta and Tucumán (Jiménez et al.,
when dry, wide-spreading when wet, sometimes 2009).
producing rhizoids at back, keeled; laminal
cells rounded-quadrate to rounded, prominently
bulging.
Comments. This species is characterized by its
ligulate to lingulate leaves, which are strongly
550