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BFNA Title: Buckiella |
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Buckiella - Hypnaceae BUCKIELLA (Hedwig) Ireland, Novon 11: 55. 2001 * [For the bryologist William R.
Buck] Hypnum undulatum Hedwig,
Sp. Musc. Frond. 242. 1801 Robert R. Ireland Plants large, in thin to
loose, prostrate, complanate-foliate or sometimes erect and julaceous, light-
or whitish-green, sometimes yellowish green, dull or somewhat glossy
mats. Stems to 15 cm or
longer, sparingly and irregularly branched, occasionally simple, branches
sometimes attenuate at apices, epidermal layer of stem cells large and
thin-walled, central strand sometimes present, rhizoids brown to reddish
brown, smooth or minutely papillose, on leaves on undersurface of stems from
base of stems and branches about halfway up and borne on base of costa and
adjacent cells on abaxial surface. Leaves
of stem and branches similar, crowded, imbricate, somewhat contorted,
strongly undulate, especially near apex, concave, usually symmetric, weakly
decurrent, ovate to ovate-lanceolate, rarely oblong-lanceolate, acute to
acuminate, rarely somewhat obtuse; margins plane, entire or usually serrulate
to serrate at apices; costa short and double, ending a short distance distal
to base, rarely one branch reaching 1/3 length of leaf; leaf cells covered
with minute, granular, cuticular papillae, the papillae much more abundant on
the abaxial surface, walls of basal cells pitted; decurrent alar region
triangular in outline, consisting of 1--3 longitudinal rows of rectangular
cells, terminating at the base in a single cell. Specialized asexual reproduction lacking. Sexual condition dioicous, often fruiting;
perigonia and perichaetia at bases of stems, perigonial bracts broadly
ovate-lanceolate, acute, perichaetial bracts narrowly ovate-lanceolate to
oblong-lanceolate, acute to acuminate, bract margins plane. Seta solitary, dark red, reddish-
to light-brown, often curved, rarely circinate, smooth. Capsule inclined to pendulous,
arcuate, sometimes straight, light- to orange-brown, cylindrical, smooth,
wrinkled and contracted below mouth when dry; annulus of 1--2 rows of large
cells, deciduous; operculum conic to rostrate, shorter than urn; stomata
sparse, present in the neck, superficial; peristome double, exostome teeth
papillose in distal half, with fine striations between the lamellae in
proximal half; endostome with 2--3 cilia, as long or nearly as long as
segments. Calyptra cucullate,
smooth, naked. Spores globose
to ovoid, smooth or minutely papillose. Species 2 (1 in the flora): North America,
Europe, Asia, Pacific Islands (Hawaii, New Guinea). This genus occurs in terrestrial habitats in temperate,
boreal, and rarely tropical woods. SELECTED REFERENCES Ireland, R.R.
1969. A taxonomic revision of
the genus Plagiothecium for North America, north of Mexico. National Museums of Canada, Nat. Mus. Nat.
Sciences, Publs. in Botany 1: 1--118.
Ireland, R.R. 2001. Buckiella,
a new genus in the Hypnaceae (Musci).
Novon 11: 55--62. Pederson, N.
and L. Hedenäs. 2002. Phylogeny of the Plagiotheciaceae based on
molecular and morphological evidence.
Bryologist 105: 310--324. 1. Buckiella undulata
(Hedwig) Ireland, Novon 11: 55. 2001 Plagiothecium undulatum (Hedwig)
Schimper in Bruch, Schimper & W. Gümbel, Bryol. Eur. 5: 195. 1851 (fasc. 48 Mon. 17. 13); Neckeropsis undulata (Hedwig)
Kindberg; Plagiothecium undulatum subsp.subneckeroideum Kindberg;
Plagiothecium undulatum var. myurum Cardot & Thériot;
Stereodon undulatus (Hedwig) Mitten Stems 15 cm or longer ×
1--7 mm. Leaves 2--5 × 1--2
mm; median cells 96--175 × 7--11 µm. Capsule
1.5--4 × 0.4--0.9 mm; operculum 0.8--1.2 mm.
Spores 11--14 µm. Logs, stumps and bases of trees in coniferous
woods, sometimes on boggy soil or soil and humus overlying rock; 0--1310 m;
B.C.; s Alaska (extending out to Attu I.), n Calif., Idaho, Oreg., Wash.;
n,w,c Europe; Asia (China); New Guinea. This large, distinctive species is very common
from southern Alaska to northern California and inland to Idaho. It is best recognized by its light- or
whitish-green color, large stems, often up to 15 cm or more ×
1--7 mm, its strongly undulate, ovate to ovate-lanceolate large leaves, 2--5
× 1--2 mm and its large, inclined to pendulous, arcuate, cylindrical, light-
to orange-brown capsule, exserted on a 25--45 mm seta. Microscopically, the species is
distinguished by leaf cells that are covered with granular, cuticular
papillae, visible at 400× or more
magnification. This species was previously placed in the
genus Plagiothecium in the Plagiotheciaceae, but the cells of all
species in that genus have completely smooth leaf cells unlike the papillose
cells of Buckiella, which I place in the Hypnaceae (R. R. Ireland
2001). One other species is included
in the genus Buckiella, namely B. draytonii (Sullivant)
Ireland, known only from the Hawaiian Islands.
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