BFNA Title: Hageniella
Author: W. B. Schofield 
Date: September 14, 2008
Edit Level: R
Version: 1

Bryophyte Flora of North America, Provisional Publication
Missouri Botanical Garden

BFNA Web site: http://www.mobot.org/plantscience/BFNA/bfnamenu.htm

Notice

Return to Home

 

XX. HAGENIELLA Brotherus, Oefvers. Förh. Finska Vetensk.-Soc.. 52 A[7]: 4. 1910  * [For I. Hagen, 1852--1917, Norwegian bryologist]

 

W. B. Schofield

 

Schofieldiella Buck, J. Hattori Bot. Lab. 82: 39.  1997

 

Plants slender, small, yellowish to golden-green or brownish, glossy, forming dense, shallow, creeping mats of irregularly branched shoots 1--3(--6) cm.  Leaves appressed to erect-spreading, sometimes weakly secund, ovate, concave, 0.2--0.5 mm, curving to base, weakly or not decurrent, apex toothed, costa forked or absent, confined to near base.  Leaf cells smooth, linear-flexuose to hexagonal in most of lamina, shorter toward apex, alar cells with a basal row of somewhat inflated rounded pigmented or colorless cells and smaller thin-walled rectangular supra-alar cells. Sexual condition dioicous. Seta short, 10--15 mm, smooth, red-brown. Capsule inclined, sometimes nodding when dry and operculate, slightly curved and asymmetric, ovoid to short-cylindric, 0.5--1 mm, operculum short-rostrate, exothecial cells with longitudinal walls slightly thicker than radial walls; peristome double, exostome teeth bordered, cross-striolate basally, papillose distally, endostome with high basal membrane, segments nearly same length as exostome teeth, cilia double.

 

Species 4--5 (1 in the flora): widely but disjunctively distributed, mainly in the N. Hemisphere,  North America, w Canada), Mexico, Central America, Europe, Asia.

 

The genus Hageniella was recently noted by B. C. Tan and Y. Jia (1999) to be identical to the genus Schofieldiella proposed by W. R. Buck (1997). These authors also argue for its placement in the Sematophyllaceae, rather than the Hylocomiaceae, where Buck placed it.

 

SELECTED REFERENCES  Tan, B.C. and Y. Jia 1999.  A preliminary revision of Chinese Sematophyllaceae. J. Hattori Bot. Lab 86: 1--70. Buck, W. R. 1997 Schofieldiella (Hylocomiaceae), a new genus for an old species.  J. Hattori Bot. Lab. 82: 39--46.

 

1. Hageniella micans (Mitten) B. C. Tan & Y. Jia,  J. Hattori Bot. Lab. 86: 37.  1999

 

Stereodon micans Mitten, J. Linn. Soc. London. Bot. Suppl. 1: 114.  1859; Hygrohypnum novae-caesarae (Austin) Grout, Sematophyllum micans (Mitten) Brotherus; Schofieldiella micans (Mitten) Buck

 

Plants forming mats of shoots facing downward, 1--3(--6) cm, leaves somewhat decurrent, pseudoparaphyllia narrowly foliose. 

 

Sporophytes rare. Rocks, usually somewhat shaded and near streams, low to moderate elevations; B.C.; Ga., Ky., N.J., N.Y., N.C., Pa., S.C., Tenn., Va., Vt.; Mexico; Central America (Honduras); Europe; Asia (Borneo, India, sw China, Philippines, Sikkim); Pacific Islands (Hawaii).

 

As shown in the synonymy, Hageniella micans has been baffling in its generic and familial placement. Material from Mexico and British Columbia tends to be larger than that from eastern North America. Its habitat resembles that of many species of Hygrohypnum, but it is not aquatic.  Vegetatively, it strongly resembles Sematophyllum, but Hageniella may be distinguished by the capsule shrinking below the mouth when mature, whether operculate or inoperculate. Also, the exothecial cells of the somewhat similar Brotherella are collenchymatyous, while in Hageniella the walls are thickened but not collenchymatous.