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Hymenostylium recurvirostrum (Hedw.) Dixon  
Family: Pottiaceae
[Anoectangium anomalum E.B. Bartram, moreAnoectangium eggersii (Müll. Hal.) Broth., Anoectangium flexuosum G. Negri, Anoectangium fortunatii Cardot & Thér., Anoectangium fuscum G. Negri, Anoectangium patagonicum Cardot & Broth., Anoectangium sellae G. Negri, Anoectangium sordidum Mitt., Ardeuma diversifolium (J. Froehl.) R.H. Zander & Hedd., Ardeuma recurvirostrum (Hedw.) R.H. Zander & Hedd., Ardeuma sinense (Sakurai) R.H. Zander & Hedd., Barbula curvirostris Lindb., Barbula curvirostris f. commutata (Mitt.) Lindb., Barbula curvirostris f. scabra Lindb., Barbula curvirostris var. commutata (Mitt.) Braithw., Barbula svihlae E.B. Bartram, Barbula weddellii Müll. Hal., Bryum fasciculatum Dicks., Bryum stelligerum Dicks., Cynodontium asperellum Stirt., Eucladium curvirostre C.E.O. Jensen, Eucladium curvirostre var. commutatum (Mitt.) C.E.O. Jensen, Eucladium curvirostre var. scabrum (Lindb.) C.E.O. Jensen, Eucladium recurvirostrum (Hedw.) C.E.O. Jensen, Eucladium recurvirostrum var. commutatum (Mitt.) C.E.O. Jensen, Eucladium recurvirostrum var. scabrum (Lindb.) C.E.O. Jensen, Gymnostomum aeruginosum f. stelligerum (Mönk.) Laz., Gymnostomum atroviride Griff., Gymnostomum brevisetum Nees & Hornsch., Gymnostomum calcareum var. brevisetum (Nees & Hornsch.) Rabenh., Gymnostomum commutatum (Mitt.) Lorentz, Gymnostomum curvirostrum Brid., Gymnostomum curvirostrum var. brevisetum (Nees & Hornsch.) Hampe, Gymnostomum curvirostrum var. commutatum (Mitt.) Cardot & Thér., Gymnostomum curvirostrum var. microcarpon (Nees & Hornsch.) Hampe, Gymnostomum curvirostrum var. pallidisetum (Nees & Hornsch.) Lesq., Gymnostomum curvirostrum var. pomiforme (Nees & Hornsch.) Hampe, Gymnostomum curvirostrum var. scabrum Paris, Gymnostomum globosum Hornsch., Gymnostomum kunzeanum (Müll. Hal.) Paris, Gymnostomum microcarpon Nees & Hornsch., Gymnostomum microcarpon var. pallidisetum (Nees & Hornsch.) Hartm., Gymnostomum microcarpon var. pomiforme (Nees & Hornsch.) Huebener, Gymnostomum orizabanum Schimp., Gymnostomum pallidisetum Nees & Hornsch., Gymnostomum pomiforme Nees & Hornsch., Gymnostomum recurvirostrum (Hedw.) Dixon, Gymnostomum recurvirostrum var. commutatum (Mitt.) Grout, Gymnostomum recurvirostrum var. recurvirostrum , Gymnostomum recurvirostrum var. scabrum (Lindb.) Grout, Gymnostomum rupestre f. stelligerum (Dicks.) Mönk., Gymnostomum rupestre var. pallidisetum (Nees & Hornsch.) Hampe, Gymnostomum rupestre var. stelligerum Hampe, Gymnostomum scabrum (Lindb.) H. Schmidt, Gymnostomum stelligerum (Dicks.) Brid. ex F. Weber & D. Mohr, Gymnostomum stillicidiorum (Mitt.) A. Jaeger, Gymnostomum uvidum Cardot, Gymnostomum venezuelense (Müll. Hal.) Paris, Gyroweisia tophicola (Müll. Hal.) Paris, Hymenostomum commutatum (Mitt.) Kindb., Hymenostylium collenchymaticum Baumgartner & J. Froehl., Hymenostylium commutatum Mitt., Hymenostylium contextum Herzog, Hymenostylium courtoisii Broth. & Paris, Hymenostylium crustaceum (Müll. Hal.) Broth., Hymenostylium curvirostrum Mitt., Hymenostylium curvirostrum f. brevisetum (Nees & Hornsch.) Dalla Torre & Sarnth., Hymenostylium curvirostrum f. pomiforme (Nees & Hornsch.) Dalla Torre & Sarnth., Hymenostylium curvirostrum var. commutatum (Mitt.) I. Hagen, Hymenostylium curvirostrum var. microcarpon (Nees & Hornsch.) Venturi, Hymenostylium curvirostrum var. pallidisetum (Nees & Hornsch.) Paris, Hymenostylium curvirostrum var. scabrum (Lindb.) Limpr., Hymenostylium diversifolium J. Froehl., Hymenostylium eggersii (Müll. Hal.) Broth., Hymenostylium firmum (Müll. Hal.) Broth., Hymenostylium glaucum (Müll. Hal.) Broth., Hymenostylium kunzeanum (Müll. Hal.) Müll. Hal., Hymenostylium longirostre Broth., Hymenostylium longopulvinatum Dusén, Hymenostylium luzonense Broth., Hymenostylium nanangium (Müll. Hal.) Broth., Hymenostylium pellucidum Broth. & Yasuda, Hymenostylium pseudorupestre Müll. Hal., Hymenostylium recurvirostrum f. microcarpon (Nees & Hornsch.) Podp., Hymenostylium recurvirostrum f. pallidisetum (Nees & Hornsch.) Podp., Hymenostylium recurvirostrum var. commutatum (Mitt.) Podp., Hymenostylium recurvirostrum var. luzonense (Broth.) E.B. Bartram, Hymenostylium recurvirostrum var. recurvirostrum , Hymenostylium recurvirostrum var. scabrum (Lindb.) Podp., Hymenostylium scabrum (Lindb.) Loeske, Hymenostylium sinense Sakurai, Hymenostylium sordidum Cardot, Hymenostylium stillicidiorum (Mitt.) Broth., Leptodontium angustinerve Thér., Merceyopsis crassinervis (Broth.) E.B. Bartram, Molendoa crassinervis Broth., Molendoa sordida (Mitt.) Steere, Pottia glauca Müll. Hal., Pottia kunzeana Müll. Hal., Pottia longirostris Hampe ex Müll. Hal., Pottia nanangia Müll. Hal., Tortula leiostoma Herzog, Tortula leiostomoides P. de la Varde, Trichostomum crustaceum Müll. Hal., Trichostomum rupestre var. stelligerum (Dicks.) Molendo, Weissia commutata (Mitt.) Braithw., Weissia curvirostra DC., Weissia curvirostris Müll. Hal., Weissia curvirostris var. commutata (Mitt.) Dixon, Weissia curvirostris var. microcarpa (Nees & Hornsch.) Müll. Hal., Weissia curvirostris var. pallidiseta (Nees & Hornsch.) Müll. Hal., Weissia curvirostris var. pomiformis (Nees & Hornsch.) Müll. Hal., Weissia curvirostris var. scabra (Lindb.) Dixon, Weissia rupestris var. stelligera (Dicks.) Müll. Hal., Weissia stillicidiorum Mitt., Weissia tophicola Müll. Hal., Weissia venezuelensis Müll. Hal., Zygodon eggersii Müll. Hal., Zygodon firmus Müll. Hal.]
Hymenostylium recurvirostrum image
Robert Klips
  • Flora of North America
  • Resources
Patricia M. Eckel in FNA Volume 27
Hymenostylium recurvirostrum
Stems: slender, fragile, 0.5–7 cm. Leaves: more or less distant; costa ending 1–2 cells before apex to percurrent or short-excurrent as a flat to conical apiculus, occasionally ending in a pellucid cell, often scalloped along margins by projecting cell walls, at mid leaf with 2–4 or occasionally several rows of cells across adaxial surface; costa adaxial surface are U-shaped in section; basal cells gradually differentiated, elongate-rectangular, less to nonpapillose proximally, larger than distal cells, 20-50 µm, 2–4:1, walls firm, narrower on the margins, pellucid; distal laminal cells heterogeneous: subquadrate to short-rectangular or rhomboidal, with occasional diagonally transverse walls, longitudinally elongate especially distally near the costa, walls commonly irregularly thickened to porose, marginal cells smaller and more quadrate, ca. 7–10(–12) µm wide, 1–3:1, 1:2, seldom 2-stratose in patches, cell walls superficially flat to somewhat convex, firm-walled; papillae low, simple to 2-fid, 1–3(–5) per lumen, dense to scattered, occasionally absent. Sexual: condition perigonial terminal and often also lateral proximally. Seta: single, (0.04–)0.5–0.9(–1) cm. Capsule: urn 0.5–0.9(–10) mm, often widest at the mouth when dry, exothecial cells thin- to thick-walled, 1–4:1, stomates phaneropore at base of capsule; annulus weakly vesiculose. Operculum ca. 0.5–1 mm, usually attached to the columella at least in some capsules. Calyptra: ca. 1–1.5 mm. Spores: ca. (13–)17–20(–22) µm. North America, Central America, South America, Europe, Asia, Africa, Atlantic Islands, Pacific Islands, Australasia.

Varieties 5 (2 in the flora). Hymenostylium recurvirostrum is distinctive among similar species in having one laminal margin typically recurved, the other erect. A character often overlooked in texts is the universal presence of a long, narrow, fragile decurrency in the basal angles. Both Gymnostomum aeruginosum and Eucladium verticillatum have an adaxial epidermis in the costal section, with papillose and quadrate cells on the adaxial surface of the costa in plane view, and the costa profile is round (convex), but Hymenostylium has long, thin and smooth cells in plane view because the epidermal layer is not developed, and the costal profile is convex adaxially, being lunate in section. In Anoectangium aestivum, as in those two species, the dense laminal papillae often obscure cell lumens, but the leaf section shows a very deeply keeled leaf with the leaf lamina adjacent to the costa nearly contiguous or touching, showing a deep, narrow channel in plane view and a circular costa section. The adaxial stereid band is always absent in A. aestivum, but often present in H. recurvirostrum. Molendoa sendtneriana is similar but has a stem central strand, and lateral perichaetia (like A. aestivum).
Hymenostylium recurvirostrum
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Hymenostylium recurvirostrum image
Robert Klips
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
Wayne Lampa
Hymenostylium recurvirostrum image
William Cook
Hymenostylium recurvirostrum image
Hymenostylium recurvirostrum image
William Cook
Hymenostylium recurvirostrum image
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William Cook
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This project made possible by National Science Foundation Awards: #1115116, #2001500, #2001394
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