'ATiite Oak. Shrinkage is low and resistance to vfeathering is excellent. 

 Durability tests indicate high resistance to attack by wood-rotting fungi. 



The properties of Ivluira-juba recormuend its use in heavy durable construction, 

 flooring, and general construction, particularly v^rhere exposure to weather- 

 ing is involved. 



5. Acapu (Vou acapoua am erican a) . The range of this species includes parts 

 of Surinam and' French Guiana^ Sut it attains its best development in the 

 state of i'a.vk, Br-azil. Tne tree is tall but the unbuttressed bole only 

 occasionally attains diameters .greater than 2 feet. The species reputedly 

 produces the best timber of French Guiana but is of infrequent occurrence 

 there. In Brazil much of the readily accessible timber has been cut although 

 considerable supplies are still available. 



The vrood is appreciably lovrer in density than Greenheart but, on the basis 

 of available green strength values, only slightly lower than Greenheart 

 in bending strength and stiffness and generally comparable in compressive 

 strengths. Shrinkage is loi'r in proportion to the density of the wood, 

 Heartwood is highly resistant to decay and insect attack, and has demon- 

 strated a high degree of resistance to marine borer attack at Harbor Island, 

 Noi'th Carolina, although conflicting resulta have been reported from tests 

 in Hawaiian waters (U). 



The dark colored timber of Acapu is highly esteemed in Brazil for all kinds 

 of heavy darable construction, flooring, and marine structures. 



Strong woods (■■hite Oak class) 



1, Mylady (Aspidqsperma crue ntum ) , This species is found from southern 

 Mexico through""Central Tmerxca to Colombia. 'The ; ylady tree is moderate 

 in size. In British Honduras few trees are larger than l|- feet in dia- 

 meter, although attaining heights in excess of 100 feet. In other parts 

 of Central Am.erica diameters of 2--3 feet are recorded. The clear bole 

 commonly extends for more t^'an two-thirds the total height of the tree. 



The vrood is much stiffer than .ihite Oak and is substantially stronger in 

 most respects. Its shrinkage compares closely with that of Oak. Resistance 

 to checking is fair. The wood is rated extremely dm^able with respect to 

 decay and adapts the timber for use in heavy durable construction, rail- 

 way crossties, sills, and framing. 



2. Mora Amarilla ( Chlorophora tin^toria). The tree and wood of iiora 

 Amarilla are well known throughout tropical America. The species is widely 

 distributed from southern iUexico to southern Brazil, Paraguay, and Argentina, 

 Under good growing conditions and particularly in the southern part of its 

 range, Llora Amarilla grows straight and tall, frequently to 2 feet in dia- 

 meter and 60-80 feet in height yjIIYi a clear bole of 20-3^ feet. In some 

 areas the trees attain diameters of hO inches and heights of 90-120 feet. 

 Although not abundant, the species is a constant factor in the forests of 

 southern Brazil, Parar^uav, and iiisiones, Argentina, ^---— 77~-^^ 



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