Barbula convoluta

Hedwig

Sp. Musc. Frond., 120. 1801,.

Treatment appears in FNA Volume 27. Treatment on page 530. Mentioned on page 529, 533, 535, 560, 575.

Stems to 1–1.5 cm. Leaves firm when wet, long-ligulate to broadly lanceolate from an oblong base, seldom ovate, 1–1.7 mm, base often elliptic, widened not strongly sheathing, margins plane or weakly recurved in proximal 1/3, apex broadly acute to rounded, entire or apiculate; costa ending 1–6 cells before the apex, rarely excurrent, abaxial costal surface with scattered solid papillae, hydroids absent; distal laminal cells firm-walled, quadrate, 8–10 µm wide, 1: 1, papillose. Specialized asexual reproduction by large, spheric to elliptic, redbrown tubers born on an often dense mass of rhizoids buried in soil, 100 to 250 µm long, or in var. gallinula by large gemmae, 120–250 µm, occurring usually singly in leaf-axils. Perichaetial leaves obtuse to broadly acute strongly sheathing and convolute; antheridiate plants short-stemmed (to 2 mm), appearing as buds on soil at base of archegoniate plants. Seta 1–1.8 cm. Theca 0.8–1.2 mm. Spores 10–12 µm.

Distribution

V27 761-distribution-map.gif

North America, Central America, Eurasia, Africa, Pacific Islands (New Zealand)

Discussion

Varieties 6 (3 in the flora).

The yellow seta, mostly plane margins, and large tubers, when present, buried in the soil, and the operculum commonly as long as the theca readily distinguish Barbula convoluta from the similar B. unguiculata. Bryoerythrophyllum ferruginascens also has tubers, but the lamina is red in KOH solution. The small antheridiate plants that appear as buds on the soil indicate the possibility of rhizautoicy, as noted by A. Casares-Gil and A. Caballero (1919–1932, vol. 2), but, because they are usually grouped, they may have been generated on protonema of a separate spore. This is one of the few species of the family to fruit in the Arctic. When sterile, Barbula convoluta may be quickly distinguished from the hygrophile Gymnostomum aeruginosum by its leaves very deeply keeled distal to mid leaf, and leaf tips more commonly reflexed and more broadly acute or rounded. Barbula convoluta differs from B. indica by its simple papillae on the abaxial surface of the costa and the commonly papillose clear cell of the apiculus, when present. Syntrichia amplexa is occasionally mistaken for B. convoluta but is immediately identified by its recurved leaf margins and red color in KOH. Although var. eustegia is clearly a western taxon, attempting to ascribe North American sterile collections to either var. eustegia or the typical variety (or fertile collections to any European variety with consistency in character combination) is presently futile (R. H. Zander 1997).

Selected References

None.

Key

1 Leaves ovate; specialized asexual reproduction as very large, oval gemmae in axils of distal leaves Barbula convoluta var. gallinula
1 Leaves long-ligulate to broadly lanceolate, seldom ovate; specialized asexual reproduction as spheric tubers on proximal rhizoids buried in soil > 2
2 Perichaetial leaves highly differentiated, strongly sheathing the seta, apex obtuse to rounded and laminal cells mostly rhomboid and smooth throughout Barbula convoluta var. convoluta
2 Perichaetial leaves weakly differentiated, more loosely sheathing the seta, apex abruptly acute to subulate and laminal cells often quadrate and papillose in distal 1/4 Barbula convoluta var. eustegia
... more about "Barbula convoluta"
quadrate +  and elongate +
differentiated +
long-excurrent +  and short-excurrent +
apiculate +  and entire +
broadly acute +  and rounded +
Richard H. Zander +
Hedwig +
short;elongate +
semilunar +
papillose +  and smooth +
usually slightly wider +
differentiated +
widened +
Pottiaceae tribe Barbuleae +
obovoid +
cucullate +
stegocarpous +
dioicous +  and sexual +
flat to bulging +
thin;evenly thickened +
1 +  and 6 +
elongate-rhomboid +  and elongate +
tomentose +  and bare +
rectangular +
quadrate;quadrate +
North America +, Central America +, Eurasia +, Africa +  and Pacific Islands (New Zealand) +
differentiated +
multicellular +
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 +
long-ligulate +
spreading +, incurved +  and weakly spreading +
ovate +  and lanceolate +
reduced +
0.1 cm1 mm <br />0.001 m <br /> (0.17 cm1.7 mm <br />0.0017 m <br />) +
dentate +  and entire +
long-conic +
photosynthetic +
2 +  and 3 +
obtuse +  and broadly acute +
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 +
archegoniate +
Sp. Musc. Frond., +
straight +
elongate +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
2 +  and 1 +
yellowish orange +, yellow +  and laminal +
2 cm20 mm <br />0.02 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
rounded-triangular +  and rounded-pentagonal +
short +  and elongate +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
Barbula convoluta +
species +
ovate;long-cylindric +
0.08 cm0.8 mm <br />8.0e-4 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
spheric;elliptic +
red +  and yellow +
thin +  and evenly thickened +
short-stemmed +  and antheridiate +
yellowish-brown;reddish-brown +
occasionally smaller than the perichaetiate +