266 BOTANICAL GAZETTE | OCTOBER 
— Husnot, Musc. Gall. 359. A/. 707. 1893.— Dixon & Jameson, Stud. Handb. 
$43. 1896.— Braithwaite, Brit. Moss Fl. 3 : 22. A/. 88. 1896. 
| mblystegium varium var. lesquereuxii Renauld & Cardot, Flora Miquel- 
onense 53. 1888. 
Amblystegium orthocladon Macoun & Kindberg, Cat. Can. Pl. 6: 219 
g2. 
Amblystegium porphyrrhizum Macoun & Kindberg, Cat. Can. Pl. 6:219. 
1892. 
Exsiccatl: Aypnum radicale Sullivant & Lesquereux, Musc. Bor. Amer. 
(ist ed.) 346. (2d ed.) 524. 
Hypnum orthocladon Sullivant & Lesquereux, Musc. Bor. Amer. (1st ed.) 
347. (2d ed.) 526. 
Amblystegium serpens var. radicale Austin, Musc. App. 376. 
Amblystegium serpens var. orthocladon Austin, Musc. App. 379. 
Hlypnum varium Macoun, Can. Musc. 320. 
Hypnum porphyrrhizum Macoun, Can. Musc. 319 (Herb. Wis.). 
Type in Herb. Hedwig. 
Gametophyte bisexual, of medium size or larger, forming exten- 
sive loose or closely crowded tufts, tufts sometimes as much as 
3™ deep, variable in color, bright green, dull dark green or pale 
yellowish green: stems 150 to 325m in diameter, 2 to 5™ 
long, obscurely angled, prostrate, abundantly branched; cen- 
tral strand 8.5 to 35m in diameter, of six to twenty-five rows 
of cells; cortex of two to four layers of cells 6 to 18¢ in 
diameter; cells of ground tissue ranging from 17 to 30M) 
branches stout or slender, 1 to 3°™ long, erect or ascending, 
flexuous, straight, or having the tips incurved, commonly 
crowded: leaves very variable in size and shape, lanceolate, 
ovate lanceolate to broadly cordate ovate, generally attaining greatest 
width in basal sixth, commonly gradually long acuminate, pom 
usually slender, straight or slightly curved, margin entire oF (in 
forms) denticulate above, flat or concave, costate, costa extending 
to the apex or well into the base of the acumen, one fifth to sai 
fourth the leaf base at line of insertion; average leaves 5004 wide 
by 1200p long, varying in width from 280 to 5754 and in 
length from 800 to 1400p, both larger and smaller forms ocur- 
ring, spreading or somewhat appressed in both moist and 
dry conditions ; leaf cells parenchymatous at base, prosenchy : 
