RUBBER (HEVEA, DISEASES 91 
gray and discolored when old : dissepiments thin, coneolorous with pore 
mouths at top. coneolorous with subiculum at base : dissepiment context 
light brown, merging to darker color of subiculum : basidia 4-spored 
clavate. 11 to 15 by 2.4 to 4 u : spores globose, sometimes flattened on 
one side to almost short allantoid. rarely broadly ellipsoid, smooth, hya- 
line, variable in size, average < 50 i S.6 by 3.2 u. : cystidia crystalline hya- 
line, short projecting or embedded, obtuse, conspicuous, rarely incrusted, 
irregularly distributed, smaller smooth hyaline cystidia also present : su- 
bicular hypha? slightly undulate, simple to rarely branched, slightly colored 
to dark brown in mass, 2 to 4 a in diameter : tramal hyphse simple, 
hyaline, slightly pseudosclerenchymatous. 2 to 3 u in diameter : mycelial 
strands smooth, tough, red to brownish red or black when old. white in- 
ternally. Originally described from Ceylon, where it is said to pass over 
from the roots of jungle trees and to cause a serious disease of the roots 
of tea and Hevea. 
P. hypolateritia (Berk.) Cke. Effused, reviving, hard and brittle when dry; 
subiculum in type inconspicuous, white, lower surface reddish horny ; mar- 
gin white pubescent when young, becoming obsolete and coneolorous with 
the pores : pores unstratified. 7 to 8 per millimeter, angular, pore mouths 
even, whitish when young, later pink or flesh colored : dissepiments thin ; 
spares curved to ellipsoid, smooth hyaline, average 3.7 to 4 by L2 ft; 
cystidia inconspicuous, slightly projecting, crystalline bodies absent from 
trama : tramal hyphae simple, rather thick walled, but not appearing 
pseud< '.sclerenehyniatie : mycelial strands white, soft when young, becom- 
ing hard and tough and red or dark red when old. This species came 
riginally from India. Because of its affinity to P. vincta and its possible 
occurrence in tropical America it is included here. It is said to eai 
serious disease of tea roots in India and Ceylon. It has been re] 
on Hevea. and is probably the cause of the wet-rot referred to Gano- 
derma pseudoferreum, since no Ganoderma is known to produce a reddish 
crust or skin on diseased roots. 
P. mettopora (Murr.) Sacc. and Trott. On dead stumps, roots, and trunks and 
on dead branches attached to living trees : Amazon region. 
P. subserpen* (Murr.), comb. nov. On dead branches on living trees 20 to 40 
feet above ground. 
P. vincta (Berk.) Cke. Effused to a large or small extent (depending upon 
shape, size, and position of substratum > . seasonal, reviving, pliable when 
fresh, hard and brittle when dry ; subiculum conspicuous in type, brown 
(probably faded with preservatives and not typical for this species), in- 
separable from smooth substrata, under surface reddish, horny, and h 
attached to irregular surfaces : margin white, fimbriate, tomentose when 
young: pores unstratified or inconspicuously stratified in some specimens. 
1 to 3 millimeters long. to 10 per millimeter, regular to angular: pore 
mouths even, slightly granular, yellowish white when young, becoming 
pink or rose color to reddish brown, sometimes with a glaucous or gray- 
ish tinge: dissepiments thin, coneolorous: dissepiment context light brown, 
darker below : basidia 4-spored, clavate. 11 to 15 by 2.4 to 4 a: spores 
globose to rarely broadly ellipsoid, smooth, hyaline, average (50) 3 to 
4 by 3.2 u ; cystidia crystalline, projecting or embedded, conspicuous, 
incrusted. irregularly distributed, smooth projecting cystidia also present: 
snbicular hyphae simple, colored slightly darker in mass. 2 to 4 a in diam- 
eter : tramal hypha? slightly pseudosclerenchymatous, simple. 2 to 4 a in 
diameter: mycelial strands white, soft, fimbriate at extremities when young, 
becoming red or dark red when old. The globose and ellipsoid slightly 
striate colored spore< so abundant in the type of P. vincta are those of a 
Hyphomycete. This species was originally described from material eol- 
lected by Salle (No. M) in Santo Domingo and has since been collected 
throughout the American Tropics on the wood of various tree-. Specimens 
have been examined from Africa. There is much in common between this 
species and P. Kypobrunnec on Hevea in the Orient. The types of both 
species have conspicuous incrusted cystidia in the hymenium or embedded 
in the trama appearing as crystalline bodies when viewed in cross section: 
hyaline smooth cystidia are also present. The by pine, owing to their 
thick walls, have a slight pseudosclerenchymatous appearance in 
section. Reddish rhizomorphs, frequently with whitish fimbriate extremi- 
ties, are present in both species; their spores are globose to broadly 
ellipsoid, and the character of decay is the same." In the herbaria 
