Acaulon muticum

(Hedwig) Müller Hal.

Bot. Zeitung (Berlin) 5: 99. 1847,.

Basionyms: Phascum muticum Hedwig Sp. Musc. Frond., 23. 1801
Treatment appears in FNA Volume 27. Treatment on page 639. Mentioned on page 638.

Plants elliptic to globose, ca. 2 mm. Stem-leaves cuspidate, broadly channeled; laminal cells smooth. Seta short, about 0.3 the diameter of the capsule. Spores spheric to elliptic, 30–50 µm, papillose or nearly smooth.

Distribution

Temperate areas of the Northern Hemisphere, Africa

Discussion

Varieties 2 (2 in the flora).

As H. A. Crum (1969) and A. J. Grout (1939) pointed out, American specimens reported as Acaulon rubrum are A. muticum var. rufescens. These plants are often small, rather three-sided and may be confused with A. triquetrum. The leaves of both varieties stain red, at least in blotches, in KOH, and they intergrade to some extent.

Selected References

None.

Key

1 Plants yellow-brown in nature, spores papillose- punctulose Acaulon muticum var. muticum
1 Plants yellow- to red-brown in nature, spores smooth or papillose-punctulate Acaulon muticum var. rufescens
... more about "Acaulon muticum"
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.175 cm1.75 mm <br />0.00175 m <br />) +
of 1-2 rows +  and differentiated +
long-excurrent +  and short-excurrent +
appressed +  and weakly spreading +
Acute (?) +  and Ovate (?) +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
Richard H. Zander +
(Hedwig) Müller Hal. +
rounded +
papillose +  and smooth +
not differentiated +
Phascum muticum +
lobed +  and mitrate +
cleistocarpous +
sexual +  and asexual +
vesiculose +  and thick-walled +
Few (?) +  and Several (?) +
elongate-rhomboid +  and elongate +
tomentose +  and bare +
rhomboid +, rarely +, hexagonal +  and subquadrate +
dentate +, entire +  and serrulate +
Temperate areas of the Northern Hemisphere +  and Africa +
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 +
spathulate +  and ovate +
reduced +
dentate +  and entire +
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 +
1 (?) +, 3 (?) +  and 4 (?) +
rectangular +  and not differentiated +
not differentiated +
Bot. Zeitung (Berlin) +
straight +
elongate +
0 cm0 mm <br />0 m <br /> (0.02 cm0.2 mm <br />2.0e-4 m <br />) +
2 +  and 1 +
red +  and laminal +
spheric +  and elliptic +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (0.05 cm0.5 mm <br />5.0e-4 m <br />) +
Acaulon muticum +
species +
ovoid;cylindric +
yellow distally and red +, orange +, red +  and yellow +
brown;reddish;yellowish-brown distally +
paroicous +, monoicous +  and dioicous +
elliptic +  and globose +
2 cm20 mm <br />0.02 m <br /> (?) +