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BFNA Title: Jamesoniella |
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Jungermanniaceae - Jamesoniella XXX. JAMESONIELLA (Spruce) Carrington, London Catalogue
of British Mosses, ed. 2, 25. 1881 * [for William Jameson, a Scottish
botanist] Jungermannia subg. Jamesoniella Spruce, Journ. Bot. 14:
202. 1876
Marie L. Hicks Plants prostrate or forming thick mats or caespitose turfs,
green to reddish‑brown or purplish‑black in exposed sites. Stems
ascending to erect or prostrate, with few terminal or intercalary branches,
either lateral or ventral; sub‑floral innovations common; rhizoids scattered
on ventral stem surface, colorless. Leaves alternate, succubous‑oblique,
ovate to quadrate‑rotundate, entire, rarely with retuse apices; leaf cell
walls moderately thickened; trigones present; oil bodies finely granular,
more than 5 per cell. Underleaves absent, or vestigial,
occasional and very small, hidden among rhizoids. Specialized asexual reproduction absent. Sexual
condition dioicous. Androecia
terminal, becoming intercalary; bracts saccate at base with an infolded
dorsal tooth; antheridia 1‑‑2 per bract, stalk 2 or 4‑seriate. Gynoecia
terminal on main shoot; bracts entire to dentate, laciniate or ciliate on
lateral margins; bracteole present, dentate to laciniate‑ciliate; perianth
exerted 1/2 or more above bracts, inflated, oblong to fusiform, smooth
cylindrical below, 4‑‑5 plicate distally, narrowed to a ciliate or dentate‑crenulate
mouth; perigynium absent. Sporophyte seta massive, of numerous
cell rows; capsule ovoid, 4‑valved, walls 4‑‑5-stratose; epidermal cells with
nodular thickenings, inner cells with semi‑annular bands; elaters 150‑‑200 × 8 µm, 2‑spiral;
spores 10‑‑15 µm, finely granular‑papillose. Species 14 (2 in the flora): tropical and temperate
areas of North America, Mexico, Central America, South America, Europe, Asia;
s Africa, Australia, Pacific Islands (New Zealand). This genus is easily recognized when fruiting by the
dentate to laciniate bracts and bracteole, not found in other entire‑leaved
genera in the flora. Sterile material
may be separated from Odontoschisma by
the larger number of smaller oil bodies in leaf cells of Jamesoniella. SELECTED REFERENCES
Schuster, R.M., 1983, New Manual of Bryology 1: 605. Nichinan. 1. Perianth mouth
ciliate; female bracts laciniate‑ciliate; leaves not undulate ..........1. Jamesoniella autumnalis 1. Perianth
mouth dentate‑crenulate; female bracts with vestigial cilia; leaves commonly
undulate . . . . 2. Jamesoniella undulifolia 1. Jamesoniella autumnalis (De Candolle) Stephani, Spec. Hep. 2: 92.1901 Jungermannia autumnalis De Candolle,
Fl. Francaise 6: 202. 1815 Plants with shoots 10‑‑30 × 1.5‑‑2.5 mm, prostrate, forming patches or thick mats,
green to reddish brown; branches few.
Stems stout, ca. 250‑‑300
µm; branching terminal type (base of branch with a lanceolate half‑leaf) or
occasionally lateral intercalary; cortical cells thin‑walled, 25‑‑30 µm,
medullary cells similar with slightly thicker walls. Leaves
imbricate, widely spreading, ovate to rounded‑quadrate, 950‑‑1100 × 950‑‑1150 µm, the
apex rounded to slightly retuse; leaf cell lumen rounded, sub‑quadrate to
hexagonal, median cells 25‑‑35 × 28‑‑40 µm; marginal cells slightly smaller, ca. 22‑-25
µm; cuticle slightly verruculose‑striolate near leaf base; cell walls thin,
trigones with concave sides, not bulging; oil bodies 7‑‑15 per cell, ovoid to
ellipsoidal, 3‑‑5 × 5‑‑9 mu, finely granular. Underleaves absent
or occasional and subulate near stem apex.
Androecia terminal, spicate,
eventually becoming intercalary; bracts in 4‑‑6 pairs, imbricate, slightly
smaller than leaves, the dorsal base ampliate with 1‑‑2 inrolled teeth;
antheridium one per bract; stalk 2‑seriate.
Gynoecia terminal on main
shoot with 1‑‑2 subfloral innovations; bracts larger than leaves, 1‑‑1.2 × 0.9‑‑1.2 mm,
sheathing at base, spreading distally, rounded to retuse with 1‑‑2 laciniate
teeth or cilia on lateral margins, the base narrowly connate with bracteole;
bracteole large, 0.3‑‑0.4 mm with several laciniate‑ciliate lobes; perianth
cylindrical to fusiform, 3‑‑3.5 mm, distall portion 4‑‑5 plicate, narrowed to
laciniate‑ciliate mouth, cilia 5‑‑10 cells long. Humus‑rich soil, rock, logs or tree bases in moist
temperate deciduous or Spruce‑fir forests; Alta; B.C. N.B., Nfld., N.S., Ont.
Que.; Alaska, Conn, Fla., Idaho, Ill., Ind., Iowa., Kans., Ky., Maine, Md.,
Mass., Mich., Minn., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Ore., Pa.,
R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo.; Mexico; Europe; Asia. Minor varieties have been reported from single sites in
the flora area. Jamesoniella autumnalis var. myriocarpa
(Brinkman) Frye and L. Clark is an inadequately described plant from a
site in Nova Scotia; the Japanese J.
autumnalis var. nipponica (S.
Hattori) S. Hattori was reported from a site in Virginia, and the more robust
J. autumnalis var. heterostipa (A. Evans) Frye & L.
Clark from Quebec. Jamesoniella autumnalis is subject to
environmental variation and the differences on which these varieties are based
are poorly understood. These plants
are most likely environmental variants. 2. Jamesoniella undulifolia (Nees) K. Müller, Rabenhorst Krypt.‑Fl. 6(2): 758.
1916 Jamesoniella schraderi var. undulifolia Nees, Naturg. Eur. Leberm.
1: 306. 1833 Plants with shoots 10‑‑30 cm × 1‑‑1.5 mm,
prostrate to erect‑caespitose when crowded, slightly laterally compressed,
simple or with few branches, green to reddish‑brown. Stems
firm, 225‑‑275 µm; branches terminal, long; cortical cells 14‑‑20 µm with
thin walls, medullary cells slightly larger.
Leaves imbricate,
orbicular, wider than long, 0.8‑‑0.85 × 0.95‑‑1.1 mm, slightly concave, the larger leaves
tending to be undulate; margins broadly rounded, entire, emarginate leaves
occasional; median leaf cells 22‑‑26 × 25‑‑34 µm; marginal cells 20‑‑25 µm; cuticle faintly
verruculose; cell walls slightly thickened; trigones present, occasionally
slightly bulging; oil bodies 6‑‑12 per cell, spherical to ellipsoid, 4‑‑5 × 6‑‑8 µm,
granular. Underleaves absent or sporadically present on sterile shoots,
very small, lanceolate or of slime papillae. Androecia terminal
becoming intercalary; bracts in 4‑‑6 pairs, imbricate, concave with an
incurved tooth at dorsal base; antheridia two per bract, stalk 4‑seriate. Gynoecia
(frequently fertile) terminal on main
shoot with large somewhat undulate subtending leaves; bracts large, up to 800
×
1200 µm, undulate, similar to distal leaves with small, obscure teeth on
margins; bracteole free, large (to 650 µm), lanceolate with 1‑‑2 teeth at
base; perianth ovoid‑oblong, inflated, contracted to plicate mouth with small
1‑‑2 celled teeth or crenulate margin formed by elongate fingerlike
cells. Peaty soil in bogs or among mosses on tundra; w and nw
Greenland; n Europe. |
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