1917] MACCAUGHEY—HAWAIIAN FLORA go 9 
from the arid raw lava flows to the most humid portions of the 
jungle forest. A number of species (Cibotium and Sadleria) 
attain arborescent stature (8-35 ft.) and many others are of large 
size.3_ The other extreme is found in the minute Hymenophyl- 
laceae. These are abundant in the rain forest, and clothe the trees 
with their filmy fronds. 
There are about 22 genera of true ferns. The largest of these 
are Asplenium, 40 spp.; Dryopteris, 21; Polypodium 14, Elapho- 
glossum 8, Diellia and Athyrium 6, Sadleria 5, Trichomanes 4. 
The number of species in the larger genera, and in some of the 
smaller as well, must be stated as approximations, as many of 
these species are in serious need of revision. Many of the forms 
hitherto described as varieties will undoubtedly be raised to specific 
rank upon careful investigation, and numerous specific wap tain 
require redefinition. 
Some of the abundant forms not indicated by the generic list 
are Marattia Douglasii, Gleichenia spp., Gymnogramme javanica, 
Vittaria elongata, Nephrolepis make Cystopteris Douglasii 
Doodya media, Odontoloma repens, Micropelia spp., Schisostegia c 
Lydgatei, Pellaea ternifolia, and Adiantum spp. These are sae of 
genera represented by only a few species. 
Salviniaceae are represented by a peceatly ssaroduved Asolla; a. 
_ Marsileaceae by 2 endemic species of Marsilea; -Equisetales are 
not represented. The Lyco Hodiale 
es have 3 genera in the foes: 
Lycopodium with to spp. and 5 endemic; Psilotum with 20 widely ae 
distributed species; and ror agpe sigied 3 endemic and I other : < 
species. About 5 5° of the F Wawan 
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