Chenia

R. H. Zander

Phytologia 65: 424. 1989 ,.

Etymology: For Chen Pan Chieh, 1907–1970, Chinese bryologist
Basionym: Phascum sect. Leptophascum Müller Hal. Flora 71: 7. 1888
Synonyms: Phascum subg. Leptophascum (Müller Hal.) G. Roth
Treatment appears in FNA Volume 27. Treatment on page 633. Mentioned on page 480, 631.

Plants forming a low turf, green distally, brownish proximally. Stems short-to-elongate, to 3 mm; hyalodermis absent, sclerodermis present, central strand weak to strong; axillary hairs small, of 3–4 cells, proximal cell firm-walled. Leaves appressed and contorted when dry, spreading when moist; ligulate to elliptic, adaxial surface occasionally grooved along costa, plane or broadly channeled across leaf. 1.5–2.5 mm; base rectangular or not differentiated in shape; margins distally plane, weakly recurved or plane basally, irregularly denticulate distally with sharp, mid cell projections ending in a simple papilla, marginal cells often smaller; apex rounded to broadly acute, occasionally sharply apiculate; costa weak, ending several (6–9) cells before the apex or percurrent, lamina inserted adaxially to laterally, adaxial cells shortrectangular, narrower than laminal cells, in 2 rows, abaxial cells shortrectangular; transverse-section rounded to elliptic, adaxial epidermis present, adaxial stereid band absent, guide cells 2 in 1 layers, hydroid strand present, small to large, abaxial stereid band very weak or occasionally absent, rounded in sectional shape, abaxial epidermis present; proximal cells differentiated across the leaf base except for one or more rows of marginal cells, rectangular; distal medial cells large, (15–) 20–25 (–30) µm wide, 1: 1, bulging-hexagonal, 1-stratose; papillae absent (distal marginal teeth may interpreted as sharp papillae), cell-walls thin, weakly trigonous, convex on both sides. Specialized asexual reproduction by brood bodies that sometimes present on rhizoids in soil. Sexual condition dioicous. [Seta ca. 1.2 cm. Capsule stegocarpous or cleistocarpous; theca ovate; annulus of 2–3 layers of strongly vesiculose cells, persistent; peristome teeth when present 16, filamentous, somewhat anastomosing, straight or weakly twisted counterclockwise. Calyptra cucullate. Spores ca. 10 µm.] KOH laminal color reaction red.

Distribution

North America, Mexico, South America, Europe, e Asia, Australia

Discussion

Species 3 (1 in the flora).

Chenia includes both cleistocarpous and peristomate taxa. The diagnostic characters are leaves ligulate to spathulate, sharply crenulate to irregularly dentate above with sharp mid-marginal wall projections, often sharply apiculate by a distinctive thick-walled cell or cells, distal laminal cells large, weakly trigonous, epapillose, and red in KOH solution.

Lower Taxa

... more about "Chenia"
elongate +  and quadrate +
channeled +  and plane +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
Richard H. Zander +
R. H. Zander +
rounded +
papillose +  and smooth +
usually slightly wider +
not differentiated;rectangular +
Phascum sect. Leptophascum +
obovoid +
mitrate +  and cucullate +
cleistocarpous +  and stegocarpous +
red +  and laminal +
dioicous +  and sexual +
convex +  and trigonous +
vesiculose +  and thick-walled +
Several (?) +, 3 (?) +  and 4 (?) +
elongate-rhomboid +  and elongate +
weak +  and strong +
tomentose +  and bare +
bulging-hexagonal +
North America +, Mexico +, South America +, Europe +, e Asia +  and Australia +
differentiated +
For Chen Pan Chieh, 1907–1970, Chinese bryologist +
multicellular +
small +  and large +
yellow +  and orange-red or red +
inserted +  and adaxially laterally +
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 +
spathulate +  and ovate +
reduced +
dentate +  and entire +
denticulate +  and plane +
short-conic;short-rostrate +
photosynthetic +
flattened +  and 2-fid +
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 +
neumann1972a +  and reese1967a +
straight +
elongate +
2 +  and 1 +
rounded-triangular +  and rounded-pentagonal +
short +  and elongate +
0 cm0 mm <br />0 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Phascum subg. Leptophascum +
Pottiaceae subfam. Pottioideae +
ovoid;cylindric +
yellow distally and red +, orange +, red +  and yellow +
stemless +  and perigoniate +
occasionally smaller than the perichaetiate +