The Internet Archive has a preservation copy of this work in our general collections.
81 the plant when growing. I have observed the same phenomena, and apparently from the same cause, in other species, but it sometimes occurs when the plant has not received any injury. I have a specimen of B. Virginianutm with two perfect fertile spikes, the common stalk forking just above the union with the sterile frond. The tendency to fork on the part of our ferns I have found to be quite common. I have noticed and received from correspondents, numerous specimens of the different genera anddoi:10.1086/325030 fatcat:s7dhsx4a55gvtaws5vgh2eyhd4