2.
Aloina hamulus
(Müller Hal.) Brotherus in H. G. A. Engler and K. Prantl, Nat. Pflanzenfam. 214 [I,3]: 428. 1902.
Barbula hamulus
Müller Hal., Bull. Herb. Boissier 5: 192. 1897
Plants
to 6 mm.
Leaves
lingulate, 0.6-2 mm, margins entire to irregularly crenulate, undifferen-tiated at base, apex cucullate; costa subpercurrent to percurrent, filaments of 3-7 cells, cells cylindric to subspheric; cells of leaf base 13-59 µm, medial and distal cells 9-26 µm, large solid papillae on abaxial surface distally.
Sexual condition
dioicous.
Seta
7-16 mm.
Capsule
urn ovoid-cylindric, 1.1-3 mm; operculum conical to long rostrate, erect or inclined, 0.5-1.2 mm; peristome to 900 µm, twisted to nearly straight.
Spores
9-13 µm.
Sporophytes unknown in flora area. Sandstone or calcareous rocks, sandy soil in dry sunny sites; moderate to high elevations (700-1800 m); Colo., Ill., Kans., La., Nebr., Okla., Tex.; Mexico; Central America (El Salvador, Guatemala).
The undifferentiated marginal cells of the leaf base and the large abaxial solid papillae near the leaf tip distinguish
Aloina hamulus
from
A. rigida
, which, in addition, has a strongly twisted and longer peristome. The ovoid-cylindric capsule and abaxially papillose leaves distinguish this species from
A. aloides
var.
ambigua
. Young leaves should be checked when papillae are not evident in mature leaves.
