MOSSES. 



[ 437 ] 



MOUGEOTIA. 



u. Leaves regularly vertical. 

 V. SCHISTOSTEGE.E. 



b. Leaves regularly subvertical. 



VI. Drepanophylle^. 



c. Leaves horizontaL 



VII. DiSTicHiACE^. Areolation of the 

 leaves parenchymatous, minute ; leaves 

 without appendicular laminae. 



VIII. FissiDENTEiE. Arcolatiou of the 

 leaves parenchymatous ; leaves produced 

 into appendicular laminae at the back and 

 point. 



II. Polystichophylla. Leaves arranged 

 in three or more straight or alterna- 

 ting rows. 



a. Leaves exhibiting narrow, green cells, forming a 

 reticulation between larger diaphanous cells. 



IX. Leucobryace^. Leaves composed 

 of several layers of columnar, empty, paren- 

 chymatous cells ; the ' intercellular ' green 

 cells three- to four-angled, interposed be- 

 tween the empty cells in a single curved row. 



X. SpHAGNACEiE. Lcavcs composcd of 

 a single stratum of empty prosenchymatous 

 cells ; intercellular green cells interposed 

 between all the empty cells. 



b. Leaves without ' intercellular ' cells. 



a. Leaves not papillose. 



1. Loosely areolated. 



XI. FuNARioiDE^. Areolation of the 

 leaf parenchymatous, lax, containing much 

 chlorophyll. 



XII. DiscELiACE^. Areolation of the 

 leaves rhomboid-prosenchymatous, destitute 

 of chlorophyll, empty, fuscescent. 



XIII. BuxBAUMiACE^. Arcolatiou of 

 the leaf hexagonal or polygonal, very minute, 

 dark-coloured, destitute of chlorophyll. 



2. Densely areolated. 



XIV. Mnioide^. Areolation of the 

 leaf in parallelograms at the base, roundly 

 hexagonally-parenchymatous towards the 

 apex ; very full of chlorophyll or more fre- 

 quently thickened (very rarely papillose). 



XV. Bryace^. Areolation of the leaf 

 prosenchymatous, ordinarily rhomboidal, 

 abounding with chlorophyll. 



XVI. DiCRANACEiE. Cclls of the leaf 

 prosenchymatous, very often intermixed with 

 parenchymatous cells (rarely scabrously pa- 

 pillose), alar basilar cells ordinarily crowded 

 and ventricose, or flat and much more 

 loosely reticulated than the upper cells. 



XVII. Leptotrichace^. Cells of the 

 leaf rhombic at the base, rectangular or both 



mixed further up, smooth, without proper 

 alar cells. 



b. Leaves papillose . 



XVIII. Bartramioide^. Cells of the 

 leaves parenchymatous, square, ordinarily 

 nodulose or scabrous with papillae at the 

 transversal sides, never opake. 



XIX. PoTTioiDE^. Cells of the leaves 

 parenchymatous, square, ordinarily covered 

 on all sides with papillae above the base, but 

 smooth and pellucid at the base. 



XX. DiPHYSciACEvE. Leaves of two 

 kinds : the cauline with the cells densely 

 hexagonally parenchymatous, abounding 

 with chlorophyll, the perichaetial leaves with 

 the cells destitute of chlorophyll and more 

 loosely reticulated. 



PLEUROCARPI. 



1. Distichophylla. Leaves arranged in 



two ojjposite rows. 



XXI. Phyllogoniace^. 



2. Tristichophylla. Leaves arranged in 

 four rows, ajjpearing like three, erect, 



of two forms. 



XXII. Hypopterygiace^. Cells of 

 the leaf everywhere prosenchymatous, equal. 



3. Polystichophylla. Leaves arranged 

 in four or more rows. 



XXIII. Mniadelphace^. Cells of the 

 leaf parenchymatous, Mnioid. 



XXIV. Hypnoide^. Cells of the leaf 

 prosenchymatous, rhombic or rounded. 



BiBL. Hooker, Taylor and Wilson, Br?/o- 

 logia Britannica ; Bruch and Schimper, 

 Bryologia Europcea ; Hedwig, Theoria gene- 

 rationis; Bridel, Bryologia universa; Miiller, 

 Synopsis Muscorum frondosorum ; Dillenius, 

 Historia Muscorum', Lanzius-Beninga, Nova 

 Acta, xxii. p. 555 ; Hofmeister, Vergleich. 

 Untersuch. Leipsic, 1837 ; Valentine, Lin- 

 nean Transactions, xviii. p. 499. 



MOTH, CLOTHES. See Tinea. 



MOTHER-CELL, or Parent-cell, is 

 the term commonly applied to the cell in 

 the interior of which a new generation of 

 cells is developed. 



MOTHER-OF-PEARL. See Shell. 



MOUGEOTIA.— A genus of Zygnemaceae 

 (Confervoid Algae), distinguished by the con- 

 jugation of the filaments taking place with- 

 out the formation of transverse processes, 

 the conjugating filaments being geniculately 

 bent. There is still obscurity as to the 

 mode of reproduction of the plants of this 

 genus. According to Vaucher, a spore is 



