140 
leaves ovate, gradually acute, very-entire. Peristomal teeth often 
irregularly perforate. 
On stones at top of well, Emma, Saline Co., Mo. (Rev. C. H. 
Demetrio). 
This species is easily distinguished from Æ. cladorrhizans by its 
short deeply inserted sparsely articulate peristomal teeth, peculiar 
annulus, and by its dark and less flattened stem and branches. 
It is exceedingly variable and the three varieties named above are 
the most aberrant forms. Judging from the figures, Hedwig’s 
type differs a good deal from the plant figured by Sullivant ; it has 
ovate leaves and rather short capsules while Sullivant figures an 
elliptical-oblong leaf and a much larger capsule. The plants cor- 
responding to Hedwig's figure grow in places that are dry at times, 
and its leaves are regularly and closely imbricated on the stout, terete 
branches. The regularity of imbrication gives a very striking ap- 
pearance like the shingles of a roof. The plants corresponding to 
Sullivant s figure grow on rotten wood and in more moist situa- 
tions; the branches are more slender, the leaves less abruptly 
apiculate and less closely and regularly imbricate. Sullivant's 
figure, 1. c., of the mouth of the capsule is incorrect ; he figures the 
mouth of the capsule as it appears when first mounted in water, 
but when cleared up with glycerine it will be seen that 2 or 3 of 
the upper rows of cells are small annulus cells. Var. /anceolatus 
is characterized principally by its lanceolate leaves and var. minor 
by its short ye var. Demetri by its strongly flattened stems 
and branches 
3. Entopon compressus (Hedw.) C. Muell. Linnaea, 18: 707. 
1844. 
Leskea compressa Hedw. Sp. Musc. 232. M. 56.f. 1-7. 1801. 
Cylindrothecitum compressum Br. & Sch. Bryol. Eur. fasc. 46— 
42... 185t. 
Gametophyte in thin dirty green mats; stem and branches 
complanate-foliate and lying in the same plane, as in Æ. cladorrhizans, 
but both much more'slender; stems often much divided, 2~5 cm. 
long, subpinnately branching; branches short; leaves becoming 
appressed in drying, causing the plants to lose their flattened ap- 
pearance in a measure; branch leaves oblong-ovate, I.1 mm. 
long by half as wide, obtuse, with apiculation very short or none, 
entire or slightly denticulate at apex, very concave; costa short 
and double; median leaf cells linear, 11: 1; basal cells quad- 
