MEMOIRS OF THE NEW YOKE BOTANICAL GARDEN 



| VOL. II 



(5. Leaves ovate or ovate-truncate to orbicular, obliquely inserted, incubous. 

 7. Leaves with a small to large ventral keel in the upper part, often 



eq u i t a n t . .\f icropterygium 



7. Leaves without a keel or wing, never equitant. 



8. Line of leaf insertion decurved, hook-form at the dorsal end; sporo- 

 phyte enclosed in a. perianth; antheridia in the axils of both male 

 bracts and braeteoles. Triandrophyllnm. 

 8. Line of leaf insertion not hook-form above; sporophyte enclosed in 

 an erect perigynium ; antheridia only in the axils of the male 

 bracts. Isotach it. 



5. Underleaves much smaller than the leaves and of a different form, or absent. 

 6. Stems appearing to be dichotomously branched. 



7. Underleaves usually deeply 3-lobed (in American species;; leafy 



branches with only seven longitudinal rows of cortical cells. Acromastigum. 

 7. Underleaves undivided, the margins variously toothed or lobed ; leafy 



branches with many longitudinal rows of cortical cells. Bazzania. 

 (5. Stems simple or irregularly branched; leaves keeled, at least above, the 

 keel often winged. 



7. Leaves bifid to one-fourth of their length ; segments broadly triangular, 



coarsely toothed ; underleaves absent. Mytilopsix. 



7. Leaves very shortly bifid; segments only a few cells high, the margins 

 entire or coarsely toothed; underleaves present or rarely absent. 



M icropteryg ium . 



Leaves 3-, ±-, 5-, 6- to many-parted. 



1. Leaves trifid (plants with quadrifid leaves may have the branch leaves trifid, 

 or occasionally trifid leaves may occur along the steins). 

 5. Plants more or less erect and radial, the leaves and underleaves large, 



alike. Triandrophyllum. 

 5. Plants definitely dorsiventral, the underleaves conspicuously smaller than 

 the leaves. 



(5. Plants appearing to be repeatedly dichotomously branched; leaves plainly 



incubous. Bazzania. 

 6. Plants irregularly branched; leaves transversely inserted or slightly suc- 



cubous. Bonneria. 

 t. Leaves quadrifid for approximately one-half of their length. 

 5. Leaves bisbifid, the middle cleft deeper than the other two (some leaves on 

 a stem unequally trifid or bifid) ; plants tending to be radially symmetric. 

 6. Plants pale green; both lateral and flagelliform branches present; globose 

 masses of cells formed at the tips of the rhizoids; antheridia in the 

 axils of both the male bracts and braeteoles; sporophyte enclosed in a 

 coelocaule bearing female bracts and braeteoles similar to the leaves. 



Vetaforma. 



6. Plants deeply pigmented with brown. 



7. Plants large, robust, pinnate to bi- or tri-pinnate, the branches of 

 limited growth ; margins of the lamina and segments of the leaves 

 and underleaves often with few to many cilia or laeiniae; sporophyte 

 enclosed in a fleshy coelocaule densely covered with scales and para- 

 phyllia. Lepicolea. 

 7. Plants small, slender, the lamina of the leaves and underleaves under 

 0.5 mm broad; margins of the leaves and underleaves entire or rarely 

 with a short tooth near the base. 

 8. Segments and lamina of the leaves and underleaves of several layers 



of cells; female bracts different from the leaves. Herzogiaria. 

 8. Segments and lamina of the leaves and underleaves unistratose except 

 for a few-celled area at the base of each sinus; female bracts and 

 braeteoles essentially like the leaves and underleaves; perianth five- 

 keeled above. Pseudolepicolea. 

 5. Leaves quadrifid but not bisbifid (occasional leaves trifid or bifid, the 

 branch leaves often trifid). 

 6. Line of leaf insertion transverse or essentially so. 



7. Underleaves smaller than the leaves; at least one segment of an under- 



leaf shorter than the rest. Microlrpidozia. 



