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Habit Plants in dense turfs, green, red-green, or yellow-green, older shoots becoming red-brown. Plants in dense swelling turfs, red to red-brown.
Stems

2–4(–6) cm, tufted, weakly comose to evenly foliate, innovations elongate and evenly foliate; usually strongly radiculose well toward stem apices.

2–4(–6) cm, fertile stems comose, innovations evenly foliate.

Leaves

green, red-green, or yellow-green, dull brown-red or brick red with age, somewhat twisted to contorted when dry, ovate, flat to weakly concave, (1–)2–3(–4) mm, not much enlarged toward stem apex;

base strongly and narrowly decurrent;

margins revolute to mid leaf or beyond, limbidium strong, in 2 or 3 rows;

apex acute;

costa short-excurrent, awn smooth;

proximal laminal cells short-rectangular, 3:1, same width or somewhat wider than more distal cells;

medial and distal cells rhomboidal, 14–22 µm wide, (2–)3:1, walls firm to often incrassate.

red, dark red-brown with age, crowded, contorted to shrunken when dry, ovate to broadly ovate-lanceolate, concave, 1–3.5(–4) mm, often gradually enlarged toward stem apex;

base uniformly red, not or weakly decurrent;

margins revolute proximally, plane distally, limbidium strong, in 2 or 3 rows;

apex acute;

costa percurrent to short-excurrent, awn stout;

proximal laminal cells rectangular, 3–4:1;

medial and distal cells 12–18 µm wide, 2–3:1, walls incrassate, porose.

Seta

1–3(–4) cm.

red-brown, 1–3(–4) cm, stout, straight to somewhat flexuose.

Sexual condition

dioicous.

dioicous.

Capsule

brown, elongate-ovate, symmetric, 3–5 mm, mouth yellow;

operculum conic, apiculate;

peristome well developed;

exostome teeth yellow basally, hyaline distally, lamellae usually straight mid tooth, pores absent along mid line;

endostome not adherent to exostome, basal membrane high, 1/2 exostome height, segments with ovate perforations, cilia long, appendiculate.

brown, elongate-pyriform, somewhat curved, 3–5 mm, mouth yellow-brown;

operculum conic, apiculate;

peristome reduced;

exostome teeth yellow basally, hyaline distally, lamellae straight, pores absent near base along mid line;

endostome not adherent to exostome, basal membrane less than 1/2 exostome height, segments with ovate perforations, cilia reduced or absent.

Spores

12–18 µm, finely papillose, pale yellow or green.

16–22(–24) µm, yellow to green.

Specialized

asexual reproduction occasional, by leaf axil gemmae, brown.

asexual reproduction uncommon, by leaf axil gemmae, brown-red, papillose.

Ptychostomum pseudotriquetrum

Ptychostomum rutilans

Phenology Capsules mature Apr–Oct. Capsules mature Jul–Aug.
Habitat Wet soil, soil over rock, rock, fens Wet soil, tundra, along streams, wetlands
Elevation low to high elevations (0-4000 m) (low to high elevations (0-13100 ft)) low to high elevations (0-2000 m) (low to high elevations (0-6600 ft))
Distribution
from FNA
AK; AR; AZ; CA; CO; CT; DC; DE; GA; IA; ID; IL; IN; KS; KY; MA; MD; ME; MI; MN; MO; MT; NC; ND; NE; NH; NJ; NV; OH; OK; OR; PA; RI; SD; TN; TX; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NL; NS; NT; NU; ON; PE; QC; SK; YT; South America; Pacific Islands (New Zealand); Greenland; Africa; Eurasia; Australia
from FNA
AK; NT; NU; Greenland; n Eurasia
Discussion

Ptychostomum pseudotriquetrum is one of the most common and widespread species of Bryaceae, absent only from the subtropics, tropics, and central Pacific Islands. Ovate decurrent leaves, short, stout awn, dense areolation, dioicous sexual condition, and long radiculose stems are characteristic. Ptychostomum bimum is smaller, with much weaker decurrencies, and is synoicous.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Ptychostomum rutilans is a distinctive arctic species with dark red shoots, usually forming dense turfs on wet soil. The species is similar to P. pallens, but differs in its incrassate porose laminal cells and reduced peristome. Small specimens are similar to Rosulabryum subelegans, which generally has green-red spirally twisted leaves and mostly grows on rock in alpine regions of northwestern Europe. D. T. Holyoak (2004) considered them the same species because the type of R. subelegans also has 2-stratose borders. They are here kept separate until more detailed studies are completed.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 28, p. 164. FNA vol. 28, p. 173.
Parent taxa Bryaceae > Ptychostomum > subg. Cladodium Bryaceae > Ptychostomum > subg. Ptychostomum
Sibling taxa
P. acutiforme, P. archangelicum, P. arcticum, P. bimum, P. calophyllum, P. cernuum, P. creberrimum, P. cryophilum, P. cyclophyllum, P. inclinatum, P. intermedium, P. knowltonii, P. lonchocaulon, P. longisetum, P. marratii, P. meesioides, P. neodamense, P. nitidulum, P. pallens, P. pallescens, P. pendulum, P. reedii, P. rutilans, P. salinum, P. schleicheri, P. subneodamense, P. turbinatum, P. warneum, P. weigelii, P. wrightii
P. acutiforme, P. archangelicum, P. arcticum, P. bimum, P. calophyllum, P. cernuum, P. creberrimum, P. cryophilum, P. cyclophyllum, P. inclinatum, P. intermedium, P. knowltonii, P. lonchocaulon, P. longisetum, P. marratii, P. meesioides, P. neodamense, P. nitidulum, P. pallens, P. pallescens, P. pendulum, P. pseudotriquetrum, P. reedii, P. salinum, P. schleicheri, P. subneodamense, P. turbinatum, P. warneum, P. weigelii, P. wrightii
Synonyms Mnium pseudotriquetrum, Bryum pseudotriquetrum Bryum rutilans, B. aeneum
Name authority (Hedwig) J. R. Spence & H. P. Ramsay ex Holyoak & N. Pedersen: J. Bryol. 29: 120. (2007) (Bridel) J. R. Spence: Phytologia 87: 22. (2005)
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