Xlll 
veinlets are unbranched it is simple (Darea) ; when 
branched, pinnately or irregularly, it is forked (Lastraea 
apiciflorum and Filix Mas.) 
When the veinlets of contiguous groups, instead of 
being lost on the frond, or so ending at margin, unite, 
the venation is compound ; and this may occur in various 
patterns ; pinnately, the lower series meeting in arches, 
(Eunephrodium, Goniopteris) ; arching freely (Anisogo- 
nium, Meniscium) ; forming a network of areolae ; when it 
is anastomosing , uniform and hexagonal, (Antrophyum 
Hemionitis) irregular, Cyrtomium, Pleocnemia, Cyrtomi 
phlebium) ; each areola including one or more free vein- 
lets, one (Goniophlebium) two (Campyloneuron) two or 
more spreading, (Amphiblestra, Sagenia, Phymatodes, 
Selliguea). Main veins may (Campyloneuron Goniop- 
teris) or may not (Phymatodes) be distinct to edge, or 
indeed throughout (Chrysodium) and all the veins may 
be observed (P. normale, Allosorus, Platyloma). 
18. Surfaces are smooth or glabrous , rough or scab- 
rous, covered with firm points or muricate ; short haired 
or pubescent, cottony or tomentose, coated with fine soft 
hairs or villose, ( Woodsia elongata) ; vitcid as in P. 
punctatum. 
19. Texture refers to firmness of structure, and is 
herbaceous (D. chaerophylla) coriaceous (Asp. aculeatum ) 
pellucid (Adiantum) ; combinations and the prefix of papy- 
raceous, and of sub again modify these terms, papyraeeo- 
