Aulacomnium palustre
Aulacomnium androgynum
aulacomnium moss, glow moss, rib bog moss
aulacomnium moss, lover's groove moss, lover's moss
yellow, yellowish green, or yellowish brown;
cross section pentagonal, cortical cells in 4–6 irregular layers, outer medulla cells thicker walled than inner, central strand conspicuous, sometimes degraded;
rhizoids between leaves throughout plants, conspicuous when dry or moist, or visible among leaves at base of plants.
yellow or brownish green;
cross section irregularly pentagonal, cortical cells in 2–4 layers, medulla cell walls thick or thin, central strand cells small;
rhizoids between leaves near base of plants.
distant and not covering rhizoids, or imbricate and rhizoids mostly hidden, undulate, twisted or straight when dry, erect-spreading when moist, broadly to narrowly lanceolate, widest at base, often concave;
base not rounded to insertion;
margins revolute usually one time, sometimes more, in proximal 2/3, irregularly serrulate at apex;
apex acute, acuminate, or narrowed, rounded, and somewhat cucullate;
costa flexuose;
laminal cells rounded quadrate, short-rectangular, or elliptic, papillae large;
basal cells often 2-stratose at insertion, walls brown.
distant near base of plants, more congested toward apex, not much different when dry or moist, oblong-lanceolate, widest above base, somewhat concave to keeled;
base slightly rounded to insertion;
margins revolute to mid leaf, weakly serrulate proximally, irregularly serrulate toward apex;
apex acute;
costa flexuose;
laminal cells round or nearly oblong, papillae blunt;
basal cells 1-stratose, hyaline.
3–5 cm.
1–1.5 cm.
inclined to horizontal, 3–4 mm;
operculum short-rostrate, rostrum blunt;
endostome cilia nodose.
suberect or horizontal, 2.5–3 mm;
operculum conic, rostrum short, blunt;
endostome cilia nodose.
10–15 µm, smooth.
10–20 µm, smooth.
asexual reproduction by bullet- or spearpoint-shaped propagula, flat at attachment, in terminal cluster.
asexual reproduction by small fusiform propagula in tight globose cluster.
as terminal discoid splash platforms;
paraphyses of 8–12 cells.
budlike in series down stem;
paraphyses of 7–10 cells.
with paraphyses absent.
with paraphyses of 9–12 cells.
Aulacomnium palustre
Aulacomnium androgynum
Aulacomnium palustre is essentially a Northern Hemisphere moss, widespread in North America, but not necessarily common throughout its range; it may be introduced in New Zealand. Numerous varieties and forms have been proposed and sometimes recognized to accommodate the range of morphological variation present in this moss (G. Sayre 1935; W. Kabiersch 1937). None of these infraspecific concepts are adopted here in the absence of thorough studies employing modern techniques. A distinctive alpine expression (var. imbricatum Bruch & Schimper) has been recognized in Colorado and elsewhere (W. A. Weber and R. C. Wittmann 2007). In such plants, the leaves cover most of the rhizoids but are narrowly lanceolate and widest near the base; this is also true in lowland expressions of A. palustre, where some populations can also have the narrowly rounded leaf apices of var. imbricatum. The leaves of this species are weakly plicate, and the costa surface cells are large and hyaline. The basal laminal cells of the inner perigonial leaves are large and smooth; the 4 or 5 distal cells are short and wider than the longer, more proximal cells. The perichaetia are in the form of splash cups.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The propagula of Aulacomnium androgynum, borne in spheric clusters at the ends of naked branches, are a distinguishing feature. This is the only species of Aulacomnium with small lanceolate leaves that are serrulate mainly beyond mid leaf and shortly rounded at the insertion. The species also lacks a hyalodermis. The distal laminal cells of A. androgynum are round or ± oblong, 1-papillose on abaxial and adaxial walls, with blunt, long papillae and thick walls. The basal laminal cells of the inner perigonial leaves are elongate to rhomboidal, large, and smooth.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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