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KEY TO THE AMERICAN SPECIES OF PHILONOTIS. 
Leaves not margined. 
Dioicous or autoicous, male flowers gemmitorm__Philonotula. 
Dioicous, male flowers discoid. 
Leaf-cells uniformly quadrate, with papillae over the 
center of the lumen Catenularia. 
Leaf-cells elongated, with papillae at the end of the 
lumen Eu-Philonotis. 
Leaves margined Pseudo-Mniobryum. 
Section L — PHILONOTULA. Bry. Eur. fas. 12: 21. (1842), as 
subgenus of Bariramia. 
Autoicous species. 
Plant 2-3 cm. high, usually without subverticillate branches 
below inflorescence ; seta 3-4 cm., long; North American 
P. radicalis. 
Plant not over 2 cm high, with 4-5 subverticillate branches 
below inflorescence; seta short; South American __P, curvaia. 
Dioicous species. 
Leaves obtuse ; costa ceasing below apex P. gracillima. 
Leaves acute. 
Plants small. 
2-3 cm. high; leaves rather broad P. sphaerocarpa. 
1-2 cm. high, leaves narrow P. tenella. 
Stems stiff; leaves closely appressed when dry __ A. rufiflora. 
Stems slender, leaves in regular rows ; innovations numer- 
ous, filiform ; capsules small P. elegantula. 
Leaves secund ; capsules small P. Moritz iana. 
Leaves shining, patent, distant P. chrysoblasta. 
Plants rather tall. 
Stems hooked at the summit ; leaves secund, closely set ; 
costa not very strong P. uncinata. 
Stems flexuous ; leaves more distant ; costa very strong 
P. crassinervia. 
Section II. — CATENULARIA Muell., Plora. 1885. 411. as section 
of Bariramia P. scabrifolia. 
Section III.— EU-PHILONOTIS Limpr., Laubm. 2: 557. (1893). 
North American species. 
Leaves sharply toothed all around ; papillae over upper end of 
lumen. 
Plants 1-2 cm. high : stem leaves oblong lanceolate, plane 
or slightly concave P. capillaris. 
Plants 3 cm. high ; stem leaves long triangular, slightly 
concave and carinate P. marchica. 
