IX. C, 3 
Robinson: Distribution of Philippine Mosses 205 
It would be expected, and so it proves, that those species whose 
range within the Philippines is widest, especially if they be 
found alike in the Mountain Province and elsewhere, should 
be also the mosf widely distributed without the Philippines. 
Perhaps, rather, it may be held surprising that even among 
these the percentage of endemism reaches 17, while for those 
that are found in the Mountain Province only, or not in the 
Mountain Province at all, the percentage of endemism is 46 and 
44 respectively. For the whole number of species considered, 
351, the percentage of endemism is 39. This is in rather singular 
agreement with the estimate made by Mr. Merrill in the case 
of the flowering plants of the Philippines. 4 The mosses, there- 
fore, agree most emphatically with the phanerogams in that a 
remarkably high proportion are confined to the Philippines. 
High as these figures are, they are not fair to the endemic 
element. There are in this herbarium collections bearing 27 
additional specific names, apart altogether from such as can be 
relegated to synonymy, and apparently except in one instance 
Doctor Brotherus has considered these to be new species, at 
least on preliminary examination. The sole exception may be 
a clerical error for a Malayan species not otherwise enumerated 
here. Should this supposed status prove correct, the percentage 
of endemism for Philippine mosses becomes 43 ; for the species 
confined to the Mountain Province, 48; for those not yet found 
in the Mountain Province, 50; for those in both regions, 18. 
Considering only the 136 endemic species indicated in the 
above table, which are distributed amongst 78 genera in 27 
families, the percentage of these found only in the Mountain 
Province is 37.5 ; not in the Mountain Province, 53 ; in both areas, 
9.5. Should the 26 above referred to all prove new species, 
these percentages will become 35, 56, and 9 respectively. 
Five, genera are endemic, Merrilliobryum ( Fabroniaceae ) 
Elmeriobryum and Plagiotheciopsis (Hypnaceae) , Pseuclorcelo- 
pus ( Polytrichaceae ) , and Porotrichodendron ( Lembophyllaceae ) . 
The first two of these are known only from the Mountain Prov- 
ince, the third from Davao in southeastern Mindanao, the fourth 
from Cagayan Province in the extreme north of Luzon but not in 
the Mountain Province, and the last, not included in the previous 
summary because it has not been found by recent collectors, 
appears from the specific name of its only species to be from 
near Majayjay, Mount Banajao. 
On investigating the 63 non-endemic species found both in 
4 Philip. Journ. Sci. 7 (1912) Bot. 171. 
126079— —2 
