Sphagnum sect. Polyclada

(C. E. O. Jensen) Horrell

J. Bot. 38: 119. 1900,.

Basionym: Polyclada C. E. O. Jensen in Botaniske Forening København, Festskrift, 82. 1890
Synonyms: Pycnoclada (Russow) H. Klinggräff
Treatment appears in FNA Volume 27. Treatment on page 85. Mentioned on page 47.

Plants small to moderate-sized, with distinct capitulum; green, brown or variegated brown and red. Stems green to redbrown, superficial cortex of 2–4 layers of efibrillose, nonornamented, enlarged, short-rectangular cells. Stem-leaves smaller than branch leaves, triangular-lingulate, with rounded apex, border entire; hyaline cells efibrillose, nonornamented, rhomboid, septate; resorbed on convex surface; concave surface intact except near apex. Branches dimorphic, spreading branches stiff; pendent branches slender and delicate. Branch fascicles with 3 (–8) spreading and 3 (–8) pendent branches. Branch stems with distinct solitary retort cells, necks not or slightly rostrate. Branch leaves ovatelanceolate, apex involute, border entire; hyaline cells fibrillose and nonornamented, convex surface with 4–6 small ringed ovate pores (approximately 1/4 the diameter of the cell), concave surface with 0–4 unringed pores per cell; chlorophyllous cells elliptic to truncate-elliptic in transverse-section, qually exposed on both surfaces. Sexual condition monoicous or dioicous. Capsule with few pseudostomata. Spores 15–24 µm; finely papillose on both surfaces; proximal laesura less than 0.5 the length of the spore.

Distribution

North America, Eurasia

Discussion

Species 1.

Selected References

None.

Lower Taxa

... more about "Sphagnum sect. Polyclada"
rounded +
Cyrus B. McQueen† +  and Richard E. Andrus +
(C. E. O. Jensen) Horrell +
Polyclada +
differentiated +
delicate +  and stiff +
ratio +, length +  and width +
ovatelanceolate +
pendent +  and spreading +
0 +  and 12 +
slender +
differentiated +
chlorophyllous +, septate +  and efibrillose +
alternating +
elliptic +  and truncate-elliptic +
strengthened +
nonornamented +
0 (?) +  and 4 (?) +
dioicous +, monoicous +  and sexual +
rhomboid +  and short-rectangular +
enlarged +
fibrillose +
spherical +
monoicous +, dioicous +  and sexual +
North America +  and Eurasia +
conspicuous +
isophyllous +, hemiisophyllous +  and anisophyllous +
inconspicuous +  and conspicuous +
rostrate +
0 +  and 4 +
tetrahedral +
septate +, porose +  and efibrillose +
triangular-lingulate +
green;redbrown +
differentiated +
concave +  and convex +
Pycnoclada +
Sphagnum sect. Polyclada +
Sphagnum +
section +
swollen +
variegated brown and red +, brown +  and green +
small +  and moderate-sized +