403 
stage of its development, the bamboos in the neighborhood should seed 
and find an entrance into it. The areas of the parang situated at some 
distance from the original forest would in all likelihood not be stocked 
with seeds from the former and thus the forest in these places would need 
to pass through a number of generations of growth, each successive one 
approaching nearer to these distant areas, before the latter could be 
reclaimed. 
Summary.—1. The Bambusa-Parkia formation occupies the region of 
the Lamao Forest Reserve at the base of the mountain. It is divided 
into two types, i. e., the climax and the parang. The former type 
occupies the upper portion of the formation, but has islands lower down 
and peninsulas extending nearly to the sea. Its area is approximately 
one-third of the entire formation. The latter has tongues extending 
into the former. It occupies approximately two-thirds of the entire 
formation. In this type are included the cogonales. 
2. All species in the parang except Psidiwm guajava are represented 
by suppressed forms in the climax type, or they are prominent forms 
which are there reduced to the coppice condition. Xerophytic areas 
of the climax type (like exposed ridges or ends of ridges) resemble 
parang forms. 
3. If left undisturbed, parang types will gradually return to the 
climax, with or without the bamboo. 
4. The parang type includes: | 
Cogonales. 
Psidium parang. 
Dinochloa parang. 
Lagerstremia-Zizyphus parang. 
Streblus-A phananthe parang. 
Mixed parang. 
5. The climax forest is closely related to Schimper’s ** monsoon trop- 
ical forest or Kurz’s *° mixed tropical forest. 
6. The Bambusa-Parkia formation, in contrast with the forest higher 
up the slopes of the mountain, is more xerophytic. This is due to less 
rainfall, lower relative humidity and greater heat. 
7. The xerophytic nature of this formation finds expression in decid- 
uous and partially deciduous trees, in semi-xerophytic structures, ever- 
green trees, and in geophilous or semi-geophilous herbs. 
IT. ANISOPTERA-STROMBOSIA FORMATION. 
This formation lies immediately above the Bambusa-Parkia forest. 
Amsoptera vidaliana (mayapis) is representative of the largest tree 
species in which Dipterocarpacee predominate. Strombosia philippin- 
ensis is the principal tree of the second story and stands for a group 
*L. c., 352, 
*T. ec. Introd., p. XXV. 
