The term sawlog is a log of suitable size for sawing into lumber, processed at a sawmill.[1] This is in contrast to those other parts of the stem that are designated pulpwood. Sawlogs will be greater in diameter, straighter and have a lower knot frequency.
Sawlogs most often come from the "butt end" of the stem and are the most financially valuable part of the tree.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction