Crossidium seriatum

H. A. Crum & Steere

SouthW. Naturalist 3: 117, figs. 1–7. 1959,.

Treatment appears in FNA Volume 27. Treatment on page 612.

Plants 1–1.5 mm. Leaves lingulate to oblong-ovate, 0.6–1.3 mm, margins revolute from near apex to near base, smooth-celled in the middle and base, apex round to slightly emarginate; costa excurrent, with an abaxial epidermis, filaments of 2–6 cells, cells subspheric, with several papillae per cell, terminal cell subspheric; cells of leaf base 24–66 µm, medial and distal cells 13–26 µm, with several papillae on either side of distal and median cells. Sexual condition cladautoicous. Seta 9–13 mm. Capsule urn oblong-cylindric, 1.5–2.3 mm; operculum 0.7–1.1 mm; peristome strongly twisted, 1015–1100 µm. Spores spheric, finely papillose, 11–13 µm.


Phenology: Capsules mature Jan–Jul.
Habitat: Sandy soil or rocks, along dry washes, in open or shaded places in deserts
Elevation: moderate elevations (400-600 m)

Distribution

V27 887-distribution-map.gif

B.C., Ariz., Calif., Nev., N.Mex., Mexico (Baja California), Europe (France), Europe (Spain), Europe (Switzerland)

Discussion

The leaf cells with several papillae on either free surface distinguish Crossidium seriatum from C. aberrans. A poorly preserved specimen from Kansas is perhaps a juvenile form with awned leaves and reduced filaments.

Selected References

None.

Lower Taxa

None.

"broad" is not a number."um" is not declared as a valid unit of measurement for this property.

... more about "Crossidium seriatum"
elongate +  and quadrate +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
Claudio Delgadillo M. +
H. A. Crum & Steere +
reniform +  and rounded +
papillose +  and smooth +
usually slightly wider +
rectangular +
rectangular;ovate +
obovoid +
cucullate +
cleistocarpous +  and stegocarpous +
cylindric;ovoid-cylindric +
oblong-cylindric +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.23 cm2.3 mm <br />0.0023 m <br />) +
monoicous +, dioicous +  and sexual +
flat to bulging +
2 (?) +  and 6 (?) +
subspheric +
tomentose +  and bare +
B.C. +, Ariz. +, Calif. +, Nev. +, N.Mex. +, Mexico (Baja California) +, Europe (France) +, Europe (Spain) +  and Europe (Switzerland) +
moderate elevations (400-600 m) +
differentiated +
multicellular +
Sandy soil or rocks, along dry washes, in open or shaded places in deserts +
yellow +  and orange-red or red +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
concave;keeled;channeled;ovoid;lanceolate or lingulate +
1-stratose +  and twisted +
imbricate +, crowded +  and distributed +
thick-walled +  and firm-walled +
with 1-8 papillae +  and smooth +
monoicous +, dioicous +  and sexual +
lingulate +  and oblong-ovate +
reduced +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.13 cm1.3 mm <br />0.0013 m <br />) +
smooth-celled +
cladautoicous +  and sexual +
inclined +  and erect +
conic;rostrate +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.11 cm1.1 mm <br />0.0011 m <br />) +
photosynthetic +
compound +, simple +, hollow +  and solid +
flattened +  and 2-fid +
lateral +  and terminal +
not differentiated +
lateral +  and terminal +
red +, orange +  and yellow +
consisting of 16 mostly 2 times cleft spiculose striate or papillose lanceolate teeth , , , , +  and rudimentary +
Capsules mature Jan–Jul. +
SouthW. Naturalist +
straight +
elongate +
0.9 cm9 mm <br />0.009 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
2 +  and 1 +
spheric +
rounded-triangular +  and rounded-pentagonal +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Crossidium seriatum +
Crossidium +
species +
ovoid;cylindric +
yellow distally and red +, orange +, red +  and yellow +
stemless +  and perigoniate +
occasionally smaller than the perichaetiate +