REVISION OF TECTA III A . 
411 
c. 2. Vastce . — Like the Decurrentes , but sori scattered. T. vasta 
(Aspidium, Blume. Enum. 142, 1828), T. Bryanti. 
d. 1. Pleocnemia. — Fronds ample, at least bipinnate, veins forming a 
single series of areolae, without free included veinlets, crown of caudex 
and bases of stipes densely covered with harsh, dark, slender paleae. 
T. leuzeana. — The inclusion of various species having nothing in com- 
mon except the venation robs Pleocnemia of all naturalness. Dryopteris 
dissidens (Mett.) 0. K. is sometimes improperly placed here. 
d. 2. Arcypteris. — Like the preceding, but fronds usually less dissected 
and areolae more numerous. 
T. irregularis. 
Tectaria is a genus of tropical ferns the specialization of which for the 
most part is in adaption to moist and windless habitats. The general 
process of phylogenetic differentiation has been a simplification 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 
complexity of the venation the sori become scattered. In Pleocnemia 
there is an adaption to the same environment by great development in 
size 1 . 
In this paper 1 have adopted the principles of nomenclature exemp- 
lified in Christensen’s Index, believing that uniformity will most quickly 
be reached by general conformity with so valuable a model. According 
to these principles, as Christensen states in the fascicle last published, 
Tectaria, and not Aspidium, is the “nomen optimum.” 
Key to Philippine species. 
1. Frond ample, pinnae broadly decurrent, and stipe winged. 
2. Frond simple. 
3. lndusium wanting ; sori scattered 1. T. Bryanti 
3. lndusium present; sori in rows 2. T. decurrens 
2. Pinnae not all connected by the broad wings 3. T. grandifolia 
1. Stipe not broadly winged; fully developed frond simply pinnate, and none save 
the basal and apical pinna; deeply cut. 
2. Lateral pinnae usually not more than 2 pairs, not pinnatifid,. the lowest pair 
forked or oblique; indusia fugacious. 
3. Not at all dimorphous; margin entire, sori scattered. 
4. Pinnae ample, ovate with curved margins 4. T. polymorplm 
4. Pinnae contracted, angular 5. T. irrigua 
3. Fertile frond somewhat restricted, sori in rows.—. 6. T. siifolia 
2. Lateral pinnae usually more numerous ; or if only 1 or 2 pairs, the lowest 
pair not forked and the indusium persistent. 
. 3. Base of pinnae round or truncate 7. T. Barberi 
3. Base of pinnae acute. 
4. Position of sori not marked on upper surface 8. T. Menyanthidis 
4. Position of sori evident on upper surface 9. T. crenata 
1. Pinnae lobed halfway to the costa, the lowest not forked 10. T. ambigua 
