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BFNA Title: Moerckiaceae Edit Level: S |
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XX. MOERCKIACEAE K. I. Goebel ex Stotler &
Crandall-Stotler Vadim
Bakalin Plants
terrestrial, bright green to deep green or purple, thallus
unlobed, few-stratose except for a rather well-defined midrib, branching
dichotomous and occasionally latero-ventral, without strong internal cell
differentiation or else with two well-defined central strands of narrow
conducting cells, underside without scales, without Nostoc colonies. Specialized asexual reproduction
absent. Sexual condition dioecious,
gametangia dorsal on main thallus segments, antheridia subtended by small
unistratose scales; archegonia clustered, each cluster surrounded by a ring
of partially fused scales forming an involucre. Sporophyte protected by a long, cylindrical pseudoperianth with
a contracted mouth. Capsule ellipsoidal,
valvate, without fixed elaters. Spores
unicellular when shed, their walls rather thin and delicate. Genera 2 (1 in the flora): North
America, Eurasia. XX. MOERCKIA Gottsche, Hepat. Eur.,
121. 1860 * [For Axel Moeller Moerck (or Mørch), 1797--1876, one of compilers
of Flora Danica] Plants
10--40 x 4--10 mm, translucent green to light, yellowish or deep green, old
portions of thalli and perichaetial apices brownish; mostly furcately branched.
Thallus plane, margins plane to
undulate, entire to crispate, median vascular strands present or absent, best
visible in cross section. Rhizoids
golden brown to brown, purplish, or colorless, distributed along ventral
surface of costa. Thallus with
1-stratose wings 10--30 cells wide, or wider but 1-stratose up to well
defined costa, margin plane to crispate. Laminar
cells thin-walled, near margin 25--70 x 25--40 \um, polygonal. Oil-bodies in marginal part of lamina
mostly 5--50 per cell, spherical to shortly ellipsoidal, almost smooth to
loosely botryoidal. Slime hairs of
1--12 cylindrical cells, brownish basally or colorless, sometimes bifurcate
or terminating in a colorless clavate slime papilla. Androecium a continuous band of erect to squarrose scale-like
edentate to dentate lamellae, each usually with 1 antheridium in its axil. Gynoecia formed on dorsal side of
costa, outer involucre of quadrate to cuneate or irregular, entire or ciliate
scales (bractlets); inner involucre (pseudoperianth) ellipsoidal-cylindric or
tubular, 4--8 mm high, dentate or ciliate-laciniate at mouth. Capsule 2(--4)-valved,
(2--)4--6-stratose. Species
3 (3 in the flora): North America, SELECTED
REFERENCE Crandall-Stotler B. J. and R. E. Stotler.
2007. On the identity of Moerckia
hibernica (Hook.) Gottsche (Moerckiaceae fam. nov., Marchantiophyta).
Nova Hedwigia. 131: 41--59. 1. Rhizoids
golden-brown to brown, sometimes with purplish tint; antheridial scales
entire to loosely crenulate, sometimes similar scales distributed along
costal region in sterile plants; thallus margin coarsely crispate; no
conducting stands in costa cross section … 1. Moerckia blyttii 1. Rhizoids
colorless, antheridial scales dentate, not present in sterile plants; thallus
margin plane or crispate; conducting stands present or absent … 2. 2. Costa sharply
set off from the lamina, obovate in cross section and suddenly thinning to
1-stratose margin, without conducting stands; thallus margin plane and entire
… 2. Moerckia hibernica 2. Costa more or
less gradually thinning into 1-stratose lamina, obtrapezoidal in cross
section, conducting stands present (but sometimes obscurely visible); thallus
margin undulate to crispate … 3. Moerckia
flotoviana 1.
Moerckia blyttii
(Moerck ex Hornemann) Brockmüller Arch. Vereins Freunde Naturgesch. Jungermannia blyttii Moerck ex
Hornemann, Fl. Dan. 12: 6. 1830 Plants
10--30 x 4--9 mm. Thallus margins
frequently distinctly and coarsely undulate to undulate-crispate, costa
moderately well-defined, ventrally convex, and gradually thinning to the
1-stratose wings, without visible median vascular strands. Rhizoids golden-brown to brown. Thallus with 1-stratose wings 10--16
cells wide, laminar cells thin-walled, near margin 28--70 x 25--35 \um,
polygonal, cells slightly elongated along margin. Oil-bodies in marginal part of lamina (2--) 5--10(--12) per cell,
spherical to shortly ellipsoidal, almost smooth to loosely botryoidal; slime
hairs formed of 1--2(--3) cylindrical cells, brownish basally, terminating in
a colorless clavate slime papilla. Androecia
with entire antheridial scales, similar scale like structures (without
antheridia) frequently formed on sterile and female thalli. Gynoecia with bractlets entire; inner
involucre (pseudoperianth) tubular, 5--8 mm high, ciliate-laciniate at mouth.
Seta 10--20 mm. Capsule ovoid-cylindric, wall
4--5-stratose. Elaters ca. 7 \um
wide. Spores 30--42 \um, not
areolate. Fine-grained soil
in wet snow-bed habitats, on peat in oligotrophic bogs,
commonly areas with oceanic climate; low or occasionally moderate elevations;
2.
Moerckia
hibernica (Hooker) Gottsche, Hepat. Eur.,
121. 1860 Jungermannia hibernica Hooker
Brit.
Jungermann., pl. 78. 1816 Plants
15--35 x 3--5 mm. Thallus with
costa well-defined, ventrally convex, more or less abruptly thinning to
1-stratose lamina, in cross section obovate, without visible vascular
strands. Rhizoids colorless. Thallus margin entire and plane. Thallus lamina cells thin-walled,
near margin 25--45 x 25--40 \um, polygonal, subisodiametrical to elongate;
surface of thallus smooth outside area with androecia or gynoecia. Oil-bodies in marginal part of lamina
minute and numerous, 18--50 per cell, virtually smooth. Androecia with antheridial scales, similar scale-like structures
(without antheridia) never formed on sterile and female thalli. Gynoecia with bractlets deeply
laciniate; inner involucre (pseudoperianth) ellipsoidal-cylindrical, 4--7 mm
high, dentate at mouth. Seta ca.
40 mm. Capsule oblong-elliptic,
reddish brown, up to 2.5 mm, wall mostly 2-stratose. Spores 30--42 \um, not areolate. Elaters ca. 8--10 \um wide. In basic bogs
developed over calcareous glacial deposits, growing among and over mosses;
low to moderate elevations; Alta., B.C., Nfld. and Labr. (Nfld.), Ont., 3.
Moerckia
flotoviana (Nees) Schiffner Oesterr. Bot. Z.
51: 41, plate 43. 1901 Cordaea flotoviana Nees
Flora, 16: 405. 1833 Plants
15--35 mm x 3--5 mm. Thallus with
costa well defined, ventrally convex, more or less gradually thinning to
1-stratose lamina, in cross section obtrapezoidal, conducting strands visible
(bust sometimes poorly defined) in cross section. Rhizoids colorless. Thallus
margin plane to crispate and undulate. Thallus lamina cells thin-walled, near margin 25--45 x 25--40
\um, polygonal, subisodiametrical to elongate; surface of thallus smooth
outside area with androecia or gynoecia. Oil-bodies
in marginal part of lamina minute and numerous, 18--50 per cell, virtually
smooth. Androecia with antheridial
scales; similar scale-like structures (without antheridia) never formed on
sterile and female thalli. Gynoecia
with bractlets deeply laciniate; inner involucre (pseudoperianth)
ellipsoidal-cylindrical, 4--7 mm high, dentate at mouth. Seta 40 mm. Capsule oblong-elliptic,
reddish brown, to 2.5 mm, wall mostly 3--4-stratose. Spores 40--50 \um, not areolate. Elaters ca. 7 \um wide. Wet slopes over
calcareous substrates along streams, more rarely in springy oligotrophic
bogs; low to moderate elevations; Alta., Nfld. and Labr. (Nfld.), N.S., Nunavut, Ont., Que.; Alaska, Conn., Maine, Mass., Mich., Nebr., N.H., N.Y., Pa., Wash., Wis.; Europe.
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