r 



100 EKYTHEA. 



involucral leaves at base, margins ciliate below, segments 

 narrow; inner involucre oblong-obovate, triquetrous, strongly 

 and rather acutely unicarinate beneath, smooth; margins of 

 perigonial leaves with one or more cilia near base, ventral 

 lobe commonly unidentate, antheridia in threes. 



On trunks of trees. Mill Valley and Olema, Marin County. 



The fronds vary in width from .7 to 1.4 mm.; leaves of the 

 ultimate branchlets are in most cases very regularly and 

 densely imbricate; the moniliform line is sometimes double, 

 usually from 5 to 12 cells long, not often takiug its origin at 

 the base of the leaf. The auricles are separated from the 

 main stems and larger branches, not rarely, by a distance of 

 120/i. Our plant may be distinguished at first sight from all 

 conditions of the polymorphous F. Asagrayann, var. Cali- 

 fornica, by its greater size, general habit of growth, and 

 mauuer of branching, and, under the microscope, by the dis- 

 tant auricles and the shape of the amphigastria. From the 

 typical form of the species mentioned it departs widely in 

 ramification, and differs also in the form of the amphigas- 

 , tria, in the form of the ventral lobe of the involucral leaves, 

 and in the ciliate-laciniate bases of the involucral leaves and 

 involucral amphigastria. The auricles, too, are farther from 

 the stem than in the Asagrayana of the eastern United 

 States, while, on the other hand, as has been observed, the 

 auricles of the latter are rather more distant than those of 

 the variety Californica. 



From FruUania tamarisci, (L.) Dumort., it differs in the 

 character of the margins of the involucral leaves, in the 

 shape of the amphigastria (commonly rhombic-obovate), and 

 in the origin of the moniliform line. 



FruUania Franciscmm is perhaps nearest F. monilkda, 

 Nees, of India, Japan, and Java, from the description of 

 which it differs in method of branching, in the form of the 

 amphigastria and their plane margins, entire dorsal lobe of 

 involucral leaves, etc. 



Plate I. a, entire fertile plant; h, capsules; c, perichsetial 

 leaves; d, one of the lower leaves; e, portions of the vertical 



