RUBBER (HEVEA) DISEASES 89 
dially branched sporangiophores, ovate or elongated, 25 to 05 by 17 to 
36.5 fi ; conidia spherical 22 to '52 //- in diameter. On leaves and fruits, 
Amazon region. 
P. meadii McRae. Mycelium branched, continuous when young, becoming 
septate when older : hyphse 3 to 6.3 to 10.8 \x in diameter, intercellular and 
intracellular, superficial; sporangia variable, usually obtuse pyriform, 
borne terminally or laterally on long or short branched sporangiophores, 
average about 26 to 56 by 15 to 27 n. On fruits. Amazon region. 
P. omnivora De By. Ceylon, Java; reported by Vincens not found in Cochin 
China. 
Pimina sp. Parasitic on Botrytis on Dothidella ulei, Amazon region, Dutch 
Guiana. 
Pleonectria heveana Sacc. On dead trunk. Malay Peninsula. 
Pleurotus angustatus B. and Br. Decay of tapped area, Ceylon. 
P. flabellatus B. and Br. On dead wood, Ceylon. 
P. sp. The species is small, dark colored, with pointed cystidia. On dead bark 
of tapping wounds. Amazon region. 
Polyporus fimbriatus Fr. On dead branches. Amazon region. 
P. flavus Jungh.=Polysticrus. 
P. grammocephalus Berk. On dead limbs. Malay Peninsula. 
P. lignosus Klotzsch. Pileus flexible, soft, drying hard and rigid, persisting 
and often reviving (sub-Polyporus), sessile, imbricate, laterally connate, 
convex or applanate to wholly resupinate, 3 to 15 centimeters long by 
3 to 25 centimeters broad, 3 to 15 millimeters thick ; surface multizonate, 
glabrous to silky, slightly concentrically sulfate and radially striate, 
conspicuously red-brown zonate. alternating with bands of yellow and 
orange, drying pale yellow-brown with concentric red-brown lines, not in- 
crusted ; margin thin, entire to lobed, yellowish when fresh, white in young 
resupinate specimens : context white to very light buff, rather soft brittle 
or fibrous. 3 to 5 millimeters thick, up to 1.5 centimeters in some specimens ; 
pore* sometimes in 2 to 4 layers, about 2 millimeters each season. to 10 
per millimeter ; pore mouths angular to circular, orange when fresh, 
drying pinkish to red-brown : edges acute, even ; dissepiments thin, per- 
manently red-brown when dry in young specimens, color in old examples 
more or less confined to the pore mouths and darker than the context ; spores 
globose, smooth, hyaline, 3% to 5 by 3 to 3.8 n\ cystidia hyaline, few 
acute dilated at base ; tramal hypha?. irregular, usually simple, occasionally 
septate, thick walled, average 2 to 4 fi ; context hyphse with thinner walls, 
usually larger, 2 to 7 fi. On roots of Hevea tirasiliensis and of many jungle 
trees. Decay white to yellowisb. undifferentiated. The species was re- 
ferred to F. semitostus in the early pathological literature on Hevea. 
but is an entirely different species. Some of the synonyms of Polyporus 
lignosus are P. kamphoveneri Fr. and P. diffusus Fr. The species is closely 
related to F. auberianus (Mont.) Murr. Van Overeem considers Polyporus 
lignosus and P. zonalis to be identical. This view appears to be untenable. 
P. mesotalpae Lloyd. Root disease. Ceylon. 
P. rugulosus Lev.=Po/>//;or//.s- zonalis Berk. 
P. wUliamsii Murr. =Fomes lamaoensis Murr. 
P. zonalis Berk. Pileus flexible when fresb. hard and rigid when dry. per- 
sisting, sessile, imbricate, convex or applanate to resupinate, rarely more 
than 4 centimeters long by 6 centimeters broad and 6 millimeters thick; 
surface with alternating bands of reddish brown, gray, or pale-tan color, 
conspicuously Concentrically grooved, rarely radially striate, glabrous or 
alternating glabrous and pruinate zones, usually incrusted. Margin thin; 
entire, or undulate: context pale brown or tan. hard, fibrous. 1 to 3 milli- 
meters thick: pores rarely stratified. 1 to 3 millimeters long, '•> to 10 per mil- 
limeter: pore mouths angular, pink or flesh colored when Eresh, drying to 
whitish, brownish or wood color: edges thin, finely granular: dissepiments 
thin, permanently wood color when dry. darker than the context : spores 
globose, smooth, hyaline, usually 1-guttulate, i to 5 by : , ,' L , to 4'._. p; cystidia 
hyaline, inconspicuous pointed or obtuse: tramal hyphse long, somewhat 
undulate, simple, rarely septate, thick walled and pseudosclerenchymatous, 
larger hyphse average 4.7 n in diameter: context hyphse straight, more 
often septate, very thick walled, larger hyphse average 8.2 u in diameter; 
intermingling smaller thinner walled, hyphse in both trania and context. 
On roots of living Hevea brasiliensis and of many jungle trees. Decay, 
white, yellowish white, usually firm, different iated with small pits or 
