tag="{http://www.w3.org/1999/xhtml}a">[O]

A case in point has been adduced[P] in which gonidia were produced by the hypha, and the genus Emericella,[Q] which is allied to Husseia in the Trichogastres, shows a structure in the stem exactly resembling Palmella botryoides of Greville, and to what occurs in Synalyssa. Emericella, with one or two other genera, must, however, be considered as connecting Trichogastres with lichens, and the question cannot be considered as satisfactorily decided till a series of experiments has been made on the germination of lichen spores and their relation to free algæ considered identical with gonidia. Mr. Thwaites was the first to point out[R] the relation of the gonidia in the different sections of lichens to different types of supposed algæ. The question cannot be settled by mere à priori notions. It is, perhaps, worthy of remark that in Chionyphe Carteri the threads grow over the cysts exactly as the hypha of lichens is represented as growing over the gonidia.