gemmae. Seta 0.8–1 cm. Capsule 1.5–2.5 mm; peristome teeth 32, linear, twisted 1/2 to once, to 1300 µm. Spores 11–12 µm. Distal laminal KOH reaction negative
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median sheath cells 80–100 × 8–12 µm (5:1), elongate-rectangular; sheath cells oblong-linear; cells of marginal lamina 12–16 µm, ± isodiametric; perichaetial
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stem-leaves, proximal laminal cells lax, wider, rectangular, 2–4: 1, 35–115 × 12–25 µm, sometimes somewhat hyaline. Specialized asexual gemmae absent. Sexual
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Stems 5–10 (–20) cm. Leaves 6–12 mm, subsquarrose and broadly spreading-recurved when moist; marginal lamina 2–5 cells wide, erect; lamellae 5–7 cells
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bilaterally symmetric, to 1.5 mm; peristome taxifolius-type; operculum ± as long as theca. Calyptra cucullate, smooth, 1–1.7 µm. Spores 7.5–12 µm. Habitat: Sandstone
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walls thickened, shortrectangular, not perforated; distal laminal cells 9–12 wide, 1: 1, papillae low, simple or scablike, 1 over each lumen, rarely absent
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speciesDidymodon leskeoides K. Saito J. Hattori Bot. Lab. 39: 508, plate 51, figs. 1–12. 1975,. Richard H. Zander Treatment appears in FNA Volume 27. Treatment on
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Smith Merrill Basionym: Polytrichum ohioense Renauld & Cardot Rev. Bryol. 12: 11. 1885 Treatment appears in FNA Volume 27. Treatment on page 131. Mentioned
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Mentioned on page 167. Cells of the mid-limb lamina (6–) 7–10 (–12) µm wide (mean 8.5 µm); cells of distal part of leaf-sheath nonpapillose on abaxial
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only perforated, arising from a low basal membrane, 20–35 µm high. Spores 12–17 µm. Habitat: Dry or fairly moist acidic rocks, boulders and outcrops Elevation:
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tip. Sexual condition dioicous or rhizoautoicous. Seta 5.5–12.5 mm. Capsule urn cylindric, 1.5–3 mm; operculum campanulate, 1–1.4 mm; peristome 600–1200
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J. Sci. 1: 289, plate 12. 1824 Treatment appears in FNA Volume 27. Treatment on page 616. Mentioned on page 615, 617. Plants 0.5–2 mm. Leaves lingulate
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distal cells 50–70 (–80) × 12–20 (–24) µm, 3–4: 1. Specialized asexual reproduction by rhizoidal tubers, in clusters of 2–5 on short lateral rhizoids of
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proximal to infertile and fertile stems. Sporophytes 1 per perichaetium. Seta to 12 mm. Capsule theca exserted, ± erect, radially symmetric to inclined, arcuate
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recurved; median and distal laminal cells rhomboidal to hexagonal, 3–4: 1, 35–70 × 12–18 µm, proximal cells rectangular, 2–4: 1, 40–70 × 18–24 µm, short-rectangular
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Plants less than 2.5 mm, gregarious in abundant, persistent, matted protonemata. Leaves setaceous to linear-lanceolate, 1.1–0.23 × 0.12–0.2 mm; margins serrate
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obscurely veined, lines of insertion on receptacle not prominent; petals 12, 16, or 20, outer greenish at least abaxially, inner creamy white; stamens
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easily distinguished. Spores of D. difficile are finely papillose-verrucose and 12–18(–20) µm; those of D. rhynchostegium are vermicularly papillose-verrucose
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Basionym: Tortula australasiae Hooker & Greville Edinburgh J. Sci. 1: 301, plate 12. 1824 Synonyms: Didymodon diaphanobasis Cardot Husnotiella torquescens (Cardot)
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1 full turn, basal membrane high, ca. 1000 µm; operculum ca. 1.5–2.5 mm. Spores (8–) 12–18 µm, spheric, finely papillose. Phenology: Capsules mature spring–early
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awns. Seta 1–3 cm, stout, flexuose, reddish-brown. Capsule 2.5–3.5 mm, short to almost cubic (1.5–2:1), inclined, becoming horizontal when mature; peristome
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laminal cells long-rectangular; medial and distal cells long-rhomboidal, 12–20 µm wide, 3–5: 1, walls thin, porose; innovation leaves redbrown, somewhat twisted
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deep, compact tufts. Stems 6–12 (–20) cm, simple, densely matted with wooly whitish to light-brownish tomentum. Leaves 2–5 (–6) mm, erect to closely appressed
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along margin, proximal cells short-rectangular to rectangular, 2–4: 1, 25–60 × 12–16 µm, short-rectangular to quadrate in alar region in 2–6 rows extending
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erect-patent when moist, straight to falcate, rigid and somewhat fragile, 2.5–3 (–3.5) × 0.5–0.9 mm; margins broadly recurved on one side throughout, narrowly recurved
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base into filiform, terete, densely spiculate-papillose divisions. Spores 8–12 µm. Habitat: Dry, exposed areas, mostly with high light intensity, acidic
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Patricia M. Eckel Basionym: Barbula brevipes Lesquereux Mem. Calif. Acad. Sci. 1: 12. 1868 Synonyms: Barbula macrotrichia Cardot & Thériot Treatment appears in
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appearing finely papillose, the lumen trapezoidal; sheath cells 46–66 × 12.5–16 µm, 4–6: 1, cells on the back of limb ± uniformly subquadrate, 11–18 µm
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abruptly short-rectangular, 2–3: 1; medial and distal cells 40–60 × 10–12 (–14) µm, 3–5: 1. Specialized asexual reproduction by rhizoidal tubers, on long rhizoids
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full turn, basal membrane high, ca. 1000 µm; operculum ca. 1–2 mm. Spores 12–18 µm, spheric, finely papillose. Phenology: Capsules mature summer. Habitat:
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narrow, 2–4 cells across adaxial surface; distal laminal cells subquadrate, 12–16 µm wide, 1: 1, smooth or less commonly papillose with 1 (–2) scattered
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1–12. 1921 Treatment appears in FNA Volume 27. Treatment on page 545. Mentioned on page 540, 546, 547. Plants green to reddish green. Stems to 1.5 cm
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perforated by transverse-slits; distal laminal cells in rather distinct rows, 7–12 wide, 1: 1 or occasionally longitudinally elongate, papillae usually absent
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twisted about 1/2 turn, basal membrane ca. 100 µm; operculum ca. 1.1 mm. Spores 12–15 µm, spheric, finely papillose. Phenology: Capsule maturity date unknown
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Capsule 0.6–1.5 mm; peristome teeth absent, rudimentary or short and 16, ligulate, cleft to near base, untwisted, to 220 µm. Spores 12–14 (–20) µm. Distal
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medial and distal cells vermicular to elongate-hexagonal, 60–90 × (8–) 10–12 µm, 6–8: 1, walls strongly incrassate, parallel to costa. Specialized asexual
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or hyaline awn. Seta (1–) 3–5 cm, stout, yellowish to reddish-brown. Capsule 2.5–5 mm, rectangular, longer than wide (1.5–2:1), reddish-brown to dark-brown
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thickened, 3–4 (–5) cells across the convex adaxial surface; distal laminal cells hexagonal, (12–) 15–18 µm wide, 1: 1, strongly papillose with 4–5 2-fid papillae
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distal laminal cells quadrate or short-rectangular, often rounded, (7–) 9–12 µm wide, smooth, weakly sinuose. Sexual condition autoicous. Capsule light-brown
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twisted 1/2–2 times, basal membrane low, to 50 µm; operculum 0.6–1 mm. Spores 8–12 µm, spheric, finely papillose or essentially smooth. Phenology: Capsules mature
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coarsely papillose, usually strongly perforated and with uneven margins. Spores 8–12 µm, smooth or granulose. Phenology: Capsules mature late spring to early summer
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squarrose, 200–350 µm, brownish or pale-yellow, papillose, perforated. Spores 10–12 µm, finely papillose. Phenology: Capsules mature late spring to early summer
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collection is from Nebraska, Chase County, 12.5 km west of Champion, W. Kiener 10627 (MO). None. None. "um" is not declared as a valid unit of measurement
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olivaceous to brownish (black), sometimes with yellowish tones. Stems 1.2–12 cm, central strand weak or absent. Leaves erect or curved, rarely (falcate)
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