THE THALLOSE HEPATICAE OF THE JUAN FEKNANDEZ ISLANDS 



567 



It will be seen that K. insularis resembles the two preceding species in 

 size and general habit but is relatively thinner than either. It agrees with A'. 

 bri'virainosa, furthermore, in its translucent texture, in its scanty development 

 of rhizoids, and in most of the characters derived from the male inflorescence. 

 It differs, however, in its monoicous inflorescence, in its ciiiolate rather than 

 lobate involucre, and in tiie more or less complete absence of marginal crenu- 

 lations which its vegetative branches exhibit. With A', cuiolutinata it agrees in 

 being monoicous, and also in the nature and arrangement of the local thickenings 

 in the capsule wall, but A. adglutinata can usually be at once distinguished 

 by its opacit)-, b\- its abundant rhizoids and by its much shorter female branches 



Fig. 3. Riccaj-dia variabilis Evans. 



A — C. Parts of thalli of various types, X 8. D. Transverse section of a wide branch, X 100. 



E, F. Transverse sections of narrower branches, X 100. G. Transverse section of a stolon, 



X 100. H. Male branch, dorsal view. The figures were all drawn from the type specimen. 



with more irregular involucres. SCHIFFNER has already compared R. insularis 

 with the closely related A. inultifioides Schiftn., of Java, and also with two other 

 species from the same island. 



Area of distribution: St. Paul and New Amsterdam; Masatierra. 



*ii. R. variabilis nov. spec. — Fig. 3. 



Growing in thin, somewhat turf-like mats, dull green becoming brownish 

 with age, more or less translucent: thallus in part prostrate and adherent to 

 the substratum but the apices of the axis and its branches often ascending; 

 axis usually subterete and wingless in the lower part, becoming flattened above 

 and often showing an indistinct wing one to three cells wide: branches very 



37 — 30579. The Xat. Hist, of Juan Fernandez and Easter Isl. Vol. II. 



