TaiBIF | Search | All Living Things


Ditrichum heteromallum (Hedwig) E. Britton
DIXON WEISSIA HETEROMALLA
Didymodon homomallus, Ditrichum homomallum; Ditrichum zonatum; Ditrichum zonatum var scabrifolium

Life   Plantae   Bryophyta   Ditrichaceae   Ditrichum


Click on map for details about points.

IDnature guides

Links
go to Discover Life's Facebook group

Following modified from Taiwan Biodiversity National Information Network
   Top | See original

&pull 20q v5.145 20180528: Error 301 Moved Permanently http://taibnet.sinica.edu.tw/eng/taibnet_species_detail.php?gen=Ditrichum&spe=heteromallum

Following modified from Flora of North America
   Top | See original

Link to Flora of North America home
 
All Floras       Advanced Search
FNA Vol. 27 Page 451, 453 , 454, 455 Login | eFloras Home | Help
FNA | Family List | FNA Vol. 27 | Ditrichaceae | Ditrichum

4. Ditrichum heteromallum (Hedwig) E. Britton in N. L. Britton et al., N. Amer. Fl. 15: 64. 1913.

Weissia heteromalla Hedwig, Sp. Musc. Frond., 71. 1801; Didymodon homomallus Hedwig; Ditrichum homomallum (Hedwig) Hampe; D. zonatum (Bridel) Kindberg; D. zonatum var. scabrifolium Dixon

Plants in loose to dense tufts, yellowish green. Stems to 1 cm, simple, seldom branched. Leaves 1.5-3 mm, erect-spreading, sometimes slightly secund, from an ovate to oblong base tapering gradually to a long channelled subula, lamina 2-stratose distally; margins plane, 1-stratose proximally, 2-stratose in the middle to distal parts; costa broad, occupying most of the subula, in section with a distinct abaxial and poorly developed adaxial stereid band; cells of subula and distal lamina elongate-rectangular, longer in the leaf base, smooth or sometimes papillose at both ends, especially near leaf apices. Specialized asexual reproduction by rarely produced rhizoidal tubers. Sexual condition dioicous. Seta reddish brown, 1-2.5 mm. Capsule erect, reddish brown, oblong to cylindric, symmetric, 0.5-1.5 mm; peristome teeth pale orange, about 300 µm, lightly papillose; operculum conic-rostrate, blunt, 0.4-0.5 mm. Spores 10-15 µm, finely papillose.

Capsules mature summer (Jun-Aug). Soil; low to high elevations (50-1500 m or higher); B.C.; Alaska, Oreg., Wash.; South America (Colombia); Europe; Asia (China, Japan, Taiwan); Atlantic Islands (Iceland).

Rhizoidal tubers were first reported for Ditrichum heteromallum by S. Risse (1985) from European material and have also been noted in Japanese material by H. Deguchi and T. Matsui (1986). They have the appearance of short filaments with swollen, contorted rhizoid cells. Ditrichum zonatum (Bridel) Kindberg, including the var. scabrifolium Dixon, appears to be only a small form of D. heteromallum with shorter, appressed leaves that are often more 2-stratose, especially near the base, and leaf cells that are sometimes papillose at the ends. We have not seen specimens that support the Wisconsin report by F. Bowers and S. Freckman (1979) and believe the record to be dubious.

Updated: 2022-09-26 04:07:51 gmt
TaiBIF | Search | All Living Things | Top
© Designed by The Polistes Corporation