The controversy over the cause of the stock poisoning in that time involved the botanist James Drummond in a series of tests to ascertain the cause of the poisoning, which was determined to be caused primarily by the plants York Road poison…
Psilotaceae is a family of ferns (class Polypodiopsida) consisting of two genera, Psilotum and Tmesipteris with about a dozen species. [1 ] It is the only family in the order Psilotales. [2 ]
The most recent fern classification recognizes four classes, 11 orders and 37 families of ferns. Thirty-two (32) fern families are documented in the Philippines based on published materials and herbarium specimens.