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BFNA Title: Pallavicinia |
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Vadim Bakalin Blyttia Endlicher Plants 15--60 mm x 2--8 mm, translucent-green
to deep green, without other pigments, with only old portion of thalli becoming brownish green or decolorate.
Thallus
branching latero-ventral, rarely furcate, thallus flattened,
margin plane or lightly undulate, with well-defined biconvex costa, mostly with clearly visible (whitish or yellowish
brownish) single median vascular strand; shoot apices ventrally with
2--3--celled slime papillae. Rhizoids
brownish, distributed along ventral surface of costa.
Thallus margin entire (except for mostly
ephemeral 1(--3)-celled teeth or slime papillae) [dentate]. Thallus lamina 1 cell in thickness, laminar
cells thin-walled, polygonal; along margin dentate-ciliate to virtually
entire. Asexual reproduction
absent. Sexual condition dioicous.
Androecia dorsal; antheridia in
one row on each side of midrib [irregularly scattered over midrib], each
subtended by a laciniate-dentate scale. Gynoecia solitary on dorsal side of costa, outer involucre of
complete ring of laciniform scales, free or united
proximally; capsule surrounded by a tubular pseudoperianth.
Seta 17--24 mm. Capsule wall 2-stratose.
Spores 17--24 \um, areolate to papillose. Elaters ca. 150--350 x 7--9 \um, 2(--3)-spiral. Species
ca. 30 (1 in the flora): North America, Central America, South America,
Eurasia, SELECTED
REFERENCE Doyle
W.T. and R.E. Stotler. 2006 Contribution toward a bryoflora
of California III. Keys and Annotated species Catalogue for Liverworts and
Hornworts. Madroño. 53: 89--197. 1. Pallavicinia lyellii (Hooker) Gray, Jungermannia lyellii Hooker,
Brit. Jungermann., pl. 77. 1816; Blyttia lyellii (Hooker) Endlicher ex Gottsche, Lindenberg & Nees Plants 15--50 x 2--6 mm. Thallus with lightly undulate
margin, with clearly visible (whitish or yellowish brownish) single median
vascular strand. Thallus margin mostly entire except for
regularly spaced ephemeral 1(--3)-celled teeth or slime papillae (quickly
disintegrating in herbarium or in old portions of thallus).
Thallus lamina with cells thin-walled,
35--100 x 24--48 \um, cells slightly elongated along margin. Oil-bodies small and numerous, in
middle part of lamina 30--65 per cell, spherical to ellipsoidal, fusiform, botryoidal to
granulate, small 2--6 x 2--4 \um to larger 8--11 x 2--5 \um. Androecia with antheridia and scales
in one row on each side of midrib; antheridial body
spherical to shortly ellipsoidal. Gynoecia
with outer involucre 1.5--2 \um high in maturity,
consisting of ciliate-laciniate segments; inner involucre (pseudoperianth)
tubular, 5--8 mm high, ciliate-laciniate at mouth. Seta 17--24 mm. Spores 17--24 \um, areolate. Elaters 2--3-spiral. Wet and shady
places along banks of ponds, stream, lakes, or in swamps associated with
flowing water, only in acidic habitats; low to moderate elevations; N.B., Nfld.
and Labr. (Nfld.), N.S., Ont.;
Ala., Ark., Calif., Conn., D.C., Fla., Ga., Ill., Ind., Ky., La., Maine, Md.,
Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio,
Pa., R.I., S.C., Tenn., Tex., Vt., Va., W.Va.; Central America: South America;
Eurasia: Africa; Pacific Islands; Australia. |