EEVISIOX OF TKCTAUIA. 411 
c. 2. Vastw. — Like the Decurrcnies, but sori scaiierud. T. vasia 
(Aspidium, Blume. Enum. 142, 1828), T. Bryanfi. 
d. 1. Pleocnemia. — Fronds uiiiplu, at least bipijuiate, veins forming a 
single series of areol.r, without free included vcinlrts, crown of caudex 
and bases of stipes densely covered with liarslt, dark, slender palore. 
T, huzeana.—Thc inclusion of various species having nothing in coni- 
mon except the venation robs Plcocnrrnia of all naturalness. f)itj aide via 
dissidcns (]ML'lt.) 0. K. is sometimes improperly placed Iicro. 
d. 2. Arc/jpten's. — Like the i)receding, but fronds usmdly less dissected 
and areolae more numerous. 
2\ irregularis, 
Tectaria is a genus of ti-opieal rcrns tlie sj)ecialization of which for the 
most part is in adaption to moist and windless liiihilats. Tlie general 
process of phylogenetic differentiation has been a Bimplifiration of the 
frond and a correlated anastomosis of the veins. In three of the groups, 
this has led to some examples with simple fronds. "With increasing 
comple^iity of the venation the sori l)ecome scattered. In Pleocnemia 
there is an adaption to the same enviromucnt by great development in 
size. 
In this paper I have adopted the principles of nomenclature exemp- 
lified in Christenson's Index, believing that uniformity will jnost quickly 
be reached by general conformity with so valuable a model. According 
to these principles, as Christensen states in the fascicle la.st published, 
Tectaria, and not Aspidiujfi, is the "nomen optimum" 
Key to Philippine species. 
1. Frond ample, pinnic broiiilly decxirrent, and .-stipo \vinge<I. 
2. Frond simple. 
3. Indnsium wanUng; sori scattered 1. T. Jiryanii 
3. Indusium present; sori in rows 2. 7*. decurrens 
2. Pinnae not all connected by the binad wings 3. T. grandifolia 
1. Stipe not broadly winged; fully develnjiod frond .simply pinnate, and none mive 
the basal and apical pinna' deeply cut. 
2. Lateral pinnje usually not more than 2 pairs, not pinnntifid, tbe lowest pnir 
forked or oblique; indusia fugacious. 
3. Not at all dimorpbous; margin entire, bori scattered. 
4. Pinna; ample, ovate with curved margins 4. T. pohfmorjtha 
4. Pinna* contracted, angular 5, T. irrirjvn 
3. Fertile frond somewhat restrieted, sori in rowrt 6. T. siifi/Jia 
2. Lateral pinujB usually more njiim-rous; or if only 1 or 2 pairs, tin- lowcnt 
pair not forked and tlie induhium persistent. 
3. Base of pinnsr* round or truncate „« 7. T. liarberi 
3. Base of pinn.T acute. 
4. Position of ^ori not marked on upjier surface S. T. M< mjnufhidis 
4. Puaition of aori evident on upper surface „ 0. T. crcnata 
\. Pinnw lol»ed halfwav to the costa, the lowe.-*t not forked 10. T. amhiyua 
