Aschisma

Lindberg

Utkast Eur. Bladmoss., 28. 1878 ,.

Etymology: Greek, a-, not or without, and schisma, split, alluding to indehiscent capsule
Synonyms: Phascum subg. Aschisma (Lindberg) Kindberg
Treatment appears in FNA Volume 27. Treatment on page 518. Mentioned on page 478, 519.

Plants small, gregarious or forming a thin mat, green. Stems ca. 0.2 mm, branching seldom; rounded-pentagonal in transverse-section, hyalodermis absent, sclerodermis absent, central strand present, weak; rhizoids absent; axillary hairs ca. 3 cells in length, basal-cell thick-walled. Leaves incurved, tubulose when dry, weakly spreading when moist; oblong or triangular to short-lanceolate, often falcate or concave, adaxial surface broadly channeled, 0.6–1 mm; base little differentiated in shape; distal margins plane to recurved, entire to sharply serrulate beyond mid leaf, bordered beyond middle, proximally or throughout by 1–3 rows weakly papillose, elongate cells; apex broadly or rounded-acute, costa excurrent as a sharp mucro, occasionally rough or denticulate, adaxial outgrowths absent, adaxial cells elongate, in 2-4 rows, transverse-section circular, adaxial epidermis absent, adaxial stereid band present, substereid, guide cells 2–4 in 1 layer, hydroid strand absent or present, abaxial stereid band present, often substereid, elliptical in section, abaxial epidermis absent; basal-cells strongly differentiated, rising higher along margins in a V, rectangular, little wider than distal cells, 3–5: 1, walls of basal-cells very thin to evenly thickened; distal medial cells quadrate to occasionally shortrectangular, 9–12 µm wide, 1: 1 (–2), papillae stout, 2-fid, crowded, scattered or centered over lumens, cell-walls evenly thickened, flat or bulging only ventrally or on both exposed surfaces. Specialized asexual reproduction absent. Sexual condition monoicous (paroicous or stalked autoicous bud at base of perichaetial plant); perichaetia terminal, interior leaves not sheathing, long-elliptic, to 1.5 mm. Seta hyaline, very short, ca. 50 µm, straight. Capsule yellowish-brown, spheric, about 0.3 mm, with a small blunt apiculus of ca. 30 µm, annulus absent; operculum absent; peristome teeth absent. Calyptra short-triangular, split once or twice, 0.2–0.3 mm, rough. Spores 18–24 µm, essentially smooth to spiculose-papillose, yellowish-brown. KOH laminal color reaction yellow.

Distribution

Kans., Europe

Discussion

Species 2 (1 in the flora).

Aschisma is widely distributed in the Mediterranean area, and is disjunctive to central North America. It is found in dry climates on soil.

Lower Taxa

... more about "Aschisma"
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
Richard H. Zander +
Lindberg +
reniform +  and rounded +
rectangular +
papillose +  and smooth +
usually slightly wider +
differentiated +
Undefined subfam. Trichostomaceae +
obovoid +
short-triangular +
yellowish-brown +
cleistocarpous +  and stegocarpous +
0.3 cm3 mm <br />0.003 m <br /> (?) +
monoicous +, sexual +  and asexual +
on both exposed surfaces +, bulging +  and flat +
vesiculose +  and thick-walled +
Few (?) +  and Several (?) +
elongate +
tomentose +  and bare +
denticulate +
entire +  and sharply serrulate +
Kans. +  and Europe +
differentiated +
Greek, a-, not or without, and schisma, split, alluding to indehiscent capsule +
multicellular +
0 cm0 mm <br />0 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
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 +
concave +, falcate +, triangular +  and short-lanceolate +
reduced +
dentate +  and entire +
short-conic;short-rostrate +
photosynthetic +
compound +, simple +, hollow +  and solid +
centered over lumens +, scattered +  and crowded +
lateral +  and terminal +
lateral +  and terminal +
red +, orange +  and yellow +
consisting of 16 mostly 2 times cleft spiculose striate or papillose lanceolate teeth , , , , +  and rudimentary +
Utkast Eur. Bladmoss., +
andrews1915a +, cridland1959a +  and smith1990a +
straight +
papillose +
straight +
elongate +
50 cm500 mm <br />0.5 m <br /> (?) +
2 +  and 1 +
2 times 0.2-0.3 mm rough +
yellow +, laminal +  and yellowish-brown +
rounded-pentagonal +
0.2 cm2 mm <br />0.002 m <br /> (?) +
Phascum subg. Aschisma +
Aschisma +
Pottiaceae subfam. Trichostomoideae +
ovoid;cylindric +
orange +  and yellow +
thin +  and evenly thickened +
stemless +  and perigoniate +
plant +, forming a thin mat +  and gregarious +