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ciliate hedwigia moss, fringe hoar-moss

hedwigia moss

Habit Plants large, sordid yellow-green, rarely bright green, pale buff to red-brown with age, sometimes hoary distally.
Stems

with stoloniform-flagelliform branches absent.

Leaves

1.5–3 mm;

margins broadly recurved to 1/3 leaf length, narrowly recurved to apex on one or both sides, or plane mid leaf and plane, erect, and/or incurved in acumen on same plant, teeth in apex broad, irregularly papillose to smooth;

apex erect, erect-spreading, or often secund when dry, broad and hyaline, muticous, or acuminate with acumen narrow-based, 1/10–1/5 leaf length, broadly or narrowly, shallowly or deeply channeled, extreme apex flat;

medial and distal laminal cells with papillae (1–)2(–4), small, simple, sessile, or low-stalked, variously branched;

laminal cells in hyaline area with papillae low, simple, in linear rows throughout or sparsely to coarsely and irregularly papillose proximally and smooth to minutely rounded-papillose distally;

apical cell short-rhomboidal, obtuse to truncate, (40–)50–75(–80) µm, multipapillose-coronate.

erect to subsecund and imbricate, not undulate-plicate, occasionally somewhat striolate when dry, 1.5–3 mm;

margins recurved or sometimes plane in proximal 1/2–2/3, plane, erect, or incurved in acumen, in larger leaves closely and irregularly dentate to spinulose-dentate in apex;

apex erect to patent when dry, wide-spreading and recurved or reflexed when moist, acute, acuminate, or subpiliferous, concolorous when muticous, or hyaline-white with pellucid tip, canaliculate-furrowed to tubular, papillose proximally, spinose-serrate medially, smooth apically;

alar cells oblate, quadrate, or short-rectangular, smooth to simple-papillose, walls even to thick and porose, region concolorous or color similar to mid basal region, in several rows along margins;

mid basal laminal cells long-rectangular, papillae 4–7, in 1 row, walls strongly thick, moderately to strongly porose, region strongly yellow- to red-orange across insertion or to 1/4–1/3(–1/2) leaf length;

medial cells 1- or multipapillose on both surfaces, papillae simple or multifid, walls thick, moderately to coarsely and irregularly porose-sinuate;

distal cells chlorophyllose and similar to medial cells, or echlorophyllose and differentiated, prorulose at distal cell ends, papillose;

apical cells pellucid, less papillose.

Seta

reddish brown, 0.5–0.9 mm, stout, hidden by perichaetial leaves.

Sexual condition

autoicous;

perichaetial leaves to 4 mm, margins entire or ciliate distally.

Capsule

deeply immersed, brown proximally, shiny red-brown at mouth, turbinate-urceolate when dry, subglobose, short-ovoid, or obovoid when moist, 1 mm, longitudinally wrinkled to sharply sulcate when dry, smooth except for neck, mouth wide;

stomata cryptoporic;

operculum planoconvex, sometimes subumbonate-apiculate.

Calyptra

naked, sparsely pilose proximally, or densely pilose throughout.

conic-mitrate, 0.5–0.9 mm, covering apex of capsule, pilose or naked.

Spores

19–30 µm, finely to somewhat coarsely vermiculate-papillose.

Perichaetia

with leaves plane, margins long-ciliate distally.

Vaginula

sparsely to densely pilose.

with paraphyses few to many, smooth, occasionally papillose, often extending onto developing calyptra.

Hedwigia ciliata

Hedwigia

Phenology Capsules mature spring–late spring.
Habitat Dry rock, acidic rock (granite, sedimentary), conglomerates, limestone, soil, cliffs, dry, sunny boulders, in woods on acidic glacial erratic rock, tree trunks and branches, asphalt shingles, edges of asphalt roads
Elevation low to high elevations (0-2300 m) (low to high elevations (0-7500 ft))
Distribution
from FNA
AK; AL; AR; AZ; CA; CO; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; MT; NC; NE; NH; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NL; NS; NT; NU; ON; QC; SK; YT; Mexico; Central America; South America; Atlantic Islands; Pacific Islands (New Zealand); Greenland; Africa; Eurasia; West Indies; Australia
[WildflowerSearch map]
Nearly worldwide
Discussion

In plants of Hedwigia ciliata with dense paraphyses extending onto the calyptra, the paraphyses are sparsely papillose and have sharp lateral teeth on one side at the distal ends of some cells. In the eastern to northeastern part of the flora area, the typical facies have vaginula and calyptra that are densely pilose. The hyaline apices are absent to short or to 1/3 the leaf length.

Although the type of Hedwigia ciliata var. leucophaea has apparently been lost, L. Hedenäs (1994) gave formal synonymy for var. leucophaea. W. R. Buck and D. H. Norris (1996) proposed the name H. nivalis for a facies of what was formerly called H. ciliata in the southwestern United States, and for all tropical American material. B. H. Allen (2010) accepted this suggestion. M. Lueth and A. Schaefer-Verwimp (2004) reported var. leucophaea as new to South America and that the two specimens of the variety were collected from the type locality of H. nivalis. The leaves in var. leucophaea are more oblong (less ovate) than in H. nivalis, the acumina are narrower, and the calyptra is pilose. These characters in the flora area are present and variable throughout the range of H. ciliata, especially in areas west of mid-continent.

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

Species 6 (3 in the flora).

Hedwigia in North America was until recently considered as a single species, with numerous varieties and forms (G. N. Jones 1933). Although a hair-point is often ascribed to species of Hedwigia, the acumen may be elongated but there is never a hairlike process as in Pseudobraunia. Long, multicellular cilia on leaf margins are rare among bryophytes (B. Goffinet et al. 2008), but are present on the perichaetial leaves in H. ciliata and H. stellata.

The type of Hedwigia integrifolia P. Beauvois was collected in North America. The name was used for a widespread species now considered Braunia imberbis (Smith) N. Dalton & D. G. Long. The type of H. integrifolia was examined by N. J. Dalton et al. (2012) and found unrelated to B. imberbis. Hedwigia integrifolia was synonymized with Hedwigidium imberbe (Smith) Bruch & Schimper by W. J. Hooker and T. Taylor (1818). Presently the application of the name H. integrifolia is awaiting further study, although G. N. Jones (1933) considered H. integrifolia a synonym of H. ciliata (B. H. Allen 2010).

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

Key
1. Medial and distal laminal cells with papillae (1-)2-4 per cell, simple, sessile, or low-stalked, variously branched; perichaetial leaf margins ciliate distally; apical laminal cell obtuse to truncate, multipapillose-coronate, short-rhomboidal, (40-)50-75(-80) µm.
H. ciliata
1. Medial and distal laminal cells with papillae usually 1 per cell, stalked, strongly, irregularly branched; perichaetial leaf margins ciliate or entire distally; apical laminal cell sharply pointed, smooth or papillose, long-linear, (80-)120-175(-200) µm
→ 2
2. Leaf apices wide-spreading to squarrose when dry; laminal cells in hyaline area with some papillae large, spinose, among shorter papillae; papillae on abaxial leaf surface with branches of unequal lengths; perichaetial leaf margins long-ciliate distally.
H. stellata
2. Leaf apices erect when dry; laminal cells in hyaline area with papillae low, simple, in lines; papillae on abaxial leaf surface with branches usually of equal lengths; perichaetial leaf margins entire.
H. detonsa
Source FNA vol. 28, p. 86. FNA vol. 28, p. 84.
Parent taxa Hedwigiaceae > Hedwigia Hedwigiaceae
Sibling taxa
H. detonsa, H. stellata
Subordinate taxa
H. ciliata, H. detonsa, H. stellata
Synonyms Anictangium ciliatum, H. ciliata subsp. subnuda
Name authority (Hedwig) P. Beauvois: Prodr. Aethéogam., 15. (1805) P. Beauvois: Mag. Encycl. 5: 304. (1804)
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