368 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



Zoopsis Hooker f. & Taylor in J. D. Hooker, Bot. Antarct. Voy. 1(1): 167. 



1844 (1847). 



Cephalozia Lindberg, p.p., Jour. Linn. Soc. Bot. 13: 190. 1872. 



Cephalozia Subg. Ill Zoopsis (Hooker f. & Taylor) Spruce, On Cephalozia 26. 1882. 

 Zoopsidella. Schuster, Nova Hedwigia 10: 24. 1965. p.p. 



Plants small; stems thread-like, flattened, in transverse section of usually 6 

 rows of large cortical cells (2 + 2 lateral, 2 ventral), surrounding the cells of the 

 medulla. Branches occasionally lateral of the Frullania type, more often ventral- 

 intercalary in the axils of the underleaves, leafy, or shorter leafy and bearing a male 

 or female inflorescence, or more rarely becoming flagelliform and more or less radial, 

 with reduced leaves or scales. Rhizoids from small cells cut off from the base of 

 the underleaves. Leaf insertion oblique, sublongitudinal. Leaves more or less bifid 

 (in Z. argentea of only 2 cells), with 2 large, elongate, usually curved "slime" 

 papillae at the tips of the segments, or along the margin in ovate leaves; cells with 

 uniformly thickened walls, without trigones. L^nderleaves of 2 adjacent cells capped 

 with slime papillae. Plants monoicous and dioicous. Male inflorescence long, ter- 

 minal or becoming intercalary on a stem or branch, the bracts and bracteoles in 

 many series, the bracts bifid, monandrous, the bracteoles like the underleaves. An- 

 theridial stalk uniseriate. Female inflorescence relatively large, the bracts and 

 bracteoles in usually 3 series, bifid. Archegonia few. Perianth cylindrical below, 

 3-keeled above, the mouth laciniate. Capsule brown, the wall of 2 layers of cells; 

 seta in transverse section (where known) of 8 large outer cells and about 4 smaller 

 inner cells. 



Type species: Jungermannia (Metzgeria) argentea Hooker f. & Taylor, 1844. 

 [Auckland Islands.] 



Key to the Species 



1. Leaves subquadrate; leaf cells subquadrate. 3. Z antillana. 



1. Leaves ovate, undivided to distinctly bifid-trapezoidal; leaf cells longer than broad. 

 2. Leaves mostly asymmetric ovate, the apex broad, rounded; plants dioicous. 



1. Z. integrifolia. 



2. Leaves mostly trapezoidal; plants monoicous. 



3. The longer leaf segment broad, rounded above. 2. Z. cynosnrandra. 



3. Leaf segments tapering to a point 2 cells broad. 4. Z. macella. 



1. Zoopsia integrifolia (Spruce) Stephani, Spec. Hep. 3: 284. 1908. 



Cephalozia integrifolia Spruce, Jour. Bot. London 14: 136. 1876. 



Cephalozia Subg. IV Alobiella, integrifolia Spruce, On Cephalozia 29. 1882. 



Zoopsidella integrifolia (Spruce) Schuster, Nova Hedwigia 10: 42. 1965. non rite public. 



Alobiella integrifolia Spruce, Hep. Sprue, in Hb. 



Plants small, light green to whitish, becoming yellowish on drying, in mats or 

 scattered among other bryophytes; stems 2-4 cm long, with leaves to 1.3 mm wide, 

 irregularly pinnate; branches frequent, ventral-intercalary, axillary, leafy or rarely 

 flagelliform, or small-leaved, often bearing a male or female inflorescence; stems 

 somewhat flattened, with 2 rows of dorsal cortical cells between the 2 rows of 

 opposite leaves. Rhizoids hyaline, short, slender, with a bulbous tip, often abundant 

 from small cells cut off from the underleaf base. Line of leaf insertion oblique, 

 sublongitudinal. Leaves plane, spreading, tending to be ascendant, asymmetric-ovate 

 when well developed, 0.5-0.65 mm long, 0.4-0.5 mm wide at the base, narrowed to 

 the scarcely crenulate, rounded apex and capped with a long narrow papilla, the 

 dorsal margin nearly straight, the ventral margin longer, convex, with the long, 

 curved marginal papilla cell just above the middle; marginal papillae 117 X 13 /i, 



