CONTENTS. 
Page. 
Tas LIcHEN Ftora oF SOUTHERN CALIFORNIA. By Hermann Edward Hasse. . 1 
Introduction. .. 2... 0.2 eee eee eee eee tee eee neee 1 
Systematic treatment. .......-.------- 220-22 ee eee eee eee ee eee eee 3 
Srupres or TroprcaAL AMERICAN Ferns—No. 4. By William R. Maxon.... 133 
Introduction. .......------2 22. - eee eee eee eee eee eee eee eee eens 133 
Asplenium trichomanes and its American allies. ....--.-------------++-+- 134 
The North American tree ferns of the genus Dicksonia.... ....--.------- 153 
The genus Odontosoria. ....-... 2.2.2.2. e ee eee ee eee eee ee eee eee eee 157 
Notes upon Bommeria and related genera.......-.-------------------+--- 168 
Bommeria.... 2-2 eee eee eee ee eee eect eens eeeees 168 
Hemionitis. .......-.----. 02 eee eee eee eee teen eeee 171 
Gymmnopteris. . ..........2-- 2-20 e ee eee eee eee eee eee 17 
Gymmnogramma..... 2.2.2.0... 2-20 ee ee eee eee 172 
Ceropteris and Pityrogramma. .......---------+++-e- eee eee e rete eee 173 
Neurogramma. ......-.--- 2-22 e eee nee ete eee ee eeee 174 
Coniogramme. ........---- 2-2-2 eee eee ee eee ee eee eee eees 174 
Summary... ...... 22.2.2 22-2 e eee eee eee eee eee e eee e eee 175 
New species of Lycopodium. .....-.------ +2200 e eee eee e eee e eee eee 175 
A new Cyathea from Santo Domingo. . ...-----------+-++----+--+--+-2+-- 178 
Mexican Grasses IN THE Untrep States Nationa Hersarium. By A. 8. 
> Hitchcock 2.2.20... 2c e ee eee cece eee eee eee eee cence eee et ener eeeeecrnes 181 
~ Introduction. ... 2.2.22. -.- eee eee eee eee eee Lecce cence eee eeeeenenees 181 
Key to the genera... 2.2.2.2... eee ee eee ene eee eet ete e teenies 181 
Annotated list of the species.......-------- 2-0-0 e sere eee eee cence cece 195 
List of new genera and species and new names. .-......-.--------------- 388 
Srupies oF TROPICAL AMERICAN Ferns—No. 5. By William R. Maxon..-. 391 
Introduction. ... 2.2 2... ee eee eee eee ee eee eee eee erences 391 
The American species of Oleandra........---------+-+-2+++-+-+--- a eeee 392 
Notes upon Polypodium duale and its allies. . -..-.--..-------+-----+-++++- 398 
New species of Polypodium. .......-.----+-----2--+-+2eererec ere eeeee 406 
Note upon Pellaea arsenit........2------- 2-222 eee eee cect 411 
A new Psilogramme from Porto Rico wi cence eee eee eee ence eens 412 
A new species of Hemitelia, section Cnemidaria, from Panama..........- 413 
The North American species of Hemitelia, section Euhemitelia....-...-- 414 
Two new species of Marattia from Panama... --.-.-----------------+--+-- 421 
Notes on Lycopodium. .....--.-.....0- +2 222-222 cree eee e eee eee eee 422 
Srupres oF TROPICAL AMERICAN Poanerogams—No. 1. By PaulC.Standley. 427 
Introduction...........-- 20 eee ee eee eee eee eee eee eee teen eee eeeeee 427 
Two new species of Dichromena.........----------++-+ 2-22 e reer eee 427 
The genus Bisboeckelera..........--.-------- +--+ +ee sere reer -..-- 428 
New leguminous plants of several genera..........--------------+-+-0++- 430 
Two new species of Leiphaimos.......-----------+----------5- eee eee eects 433 
The genus Sommera. . . .......------- 22-222 e eee eee eee tere eee te eee 434 
Nothophlebia, a new genus of Rubiaceae from Costa Rica....--.--.-.----- 437 
A revision of the genus Watsonamra.......-....-.------------ eee reese 439 
Geocardia, a new name to replace Geophila..........---------+--+---+-- 444 
New Rubiaceae from Colombia and Costa Rica...-....-----------+------- 445 
A revision of the genus Cobaea............ cece cece cece cee eee eee ee ee eres 448 
