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BFNA Title: Anastrepta |
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XX. ANASTREPTA (Lindberg) Schiffner, Hepat. in A. Engler & G. Prantl, Nat. Pflanzenfam. 1(3): 85.
1893 * [Greek ana-, throughout, and strept-, turn, alluding to leaf
tips facing the same direction] Jungermannia sect. Anastrepta Lindberg in Lindberg & Arnell, Kongl. Svenska Vetensk.. Handl., n.s. 23(5): 40. 1889 Dale
H. Vitt Plants ca 2--8(--12) cm long,
0.6--3.5 mm wide, reclining to erect. Stem transverse section with
3--4 cortical cells and 15--25 medullary cells; rhizoids short, colorless to
pale brown. Leaves subtransversely-obliquely inserted, often strongly
asymmetric, weakly and usually unequally 2-lobed, sinus obsolete or to 1/6
leaf length or less, often unlobed, asymmetric; cells with thin or somewhat
thickened walls, trigones small to large and convex; oil bodies 3--16 per
cell, homogeneous or faintly granular; underleaves absent. Sexual
condition dioicous. Specialized asexual reproduction by gemmae. Androecia
apical becoming intercalary with age, antheridial
stalk 2-seriate, female bracts leaf-like, undulate and somewhat crispate,
2--5-lobed, bracteoles 1--2-lobed. Perianth ellipsoidal to obovoid, suddenly
narrowed to a dentate-ciliate mouth. Sporophytes
unknown in flora area. Species
1 (1 in the flora): widely scattered in oceanic and mountainous areas, nw N. Amer. Europe, Asia, Pacific Ocean Islands (Hawaii). SELECTED
REFERENCES: Paton, J. A. 1999. The Liverwort Flora of the British Isles.
Harley Books, Essex, England. 1. Anastrepta orcadensis (Hooker)
Schiffner, Hepat. in A.
Engler & G. Prantl, Nat. Pflanzenfam. 1(3): 85. 1893 Jungermannia orcadensis Hooker, Brit. Jungermann, pl.
71. 1815 Plants loose,
slender, unbranched, growing among other bryophytes, dull green to
olive-green to reddish brown. Leaves
shallowly notched, erect to squarrose and reflexed toward to the ventral side
of the shoot, about 1.8 mm long and wide, concave at base, otherwise plane or
antically recurved, leaf cells 18--23 /um wide. Among
other bryophytes on peaty banks and humus on and around cliffs; sea level to
subalpine; B.C.; Alaska; Europe; Asia
(China, Japan, Russia). The
very shallowly bilobed, convex leaves are characteristic of Anastrepta orcadensis.
Additionally, the postical portion of the leaves is strongly recurved, and
there are no underleaves.
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