294 EVANS. 



uncigera Evans of the West Indies and Florida (4, p. 273), a species in 

 which the vegetative thallus bears straight hairs arising singly. 

 Dorsal gemmae with hooked hairs have been described in two West 

 Indian species, M. dichotoma and M . vivipara Evans (4, pp. 285, 288), 

 in both of which the vegetative thallus bears straight marginal hairs, 

 again arising singly. In M. vivipara twinned hairs occur as a rare 

 exception, the hairs being usually borne singly; in the other two 

 species twinned hairs are apparently never found. M. patagonica 

 shows a new combination of characters — marginal gemmae with 

 curved or hooked hairs arising in pairs and a vegetative thallus with 

 straight marginal hairs arising singly. It is this unusual association 

 that separates the species most sharply from its allies. 



Of course the structure of the costa allies M. patagonica with M . ' 

 conjugata and M.furcata, as well as with the preceding species. In M. 

 conjugata, however, no gemmae are produced and the marginal hairs of 

 the thallus are normally borne in pairs ; in M. furcata the hairs of the 

 gemmae, if present at all, are straight and arise singly; while in M. 

 divaricata the marginal hairs of both thallus and gemmae often arise 

 in pairs but are straight. Aside from these differences M . patagonica 

 can be distinguished from M. conjugata by its dioicous inflorescence 

 and from the other two species by its lack of ventral hairs on the wings. 



6. Metzgeria chilensis Steph. 

 Metzgeria chilensis Steph. Bull. Herb. Boissier 7: 937. 1899. 



Specimens examined: Quinquina Island, near Concepcion, no 

 date, Duscn 179 (M., Type). 



The following additional stations may be cited from the literature: 

 Clarence Island, Racoritza (22, p. 4) ; Quicavi, Chiloe, Skottsbcrg (24, 

 p. 10) ; Juan Fernandez, Skottsbcrg (24, p. 10) ; New Zealand, Colcnso 

 (19, p. 937). The Juan Fernandez specimen is clearly distinct from 

 the true M. chilensis; the other specimens have not been seen by the 

 writer. 



The species was based on two specimens, one from Chile and the 

 other from New Zealand. The Chilean specimen is naturally to be 

 regarded as the type, but the original description was probably partly 

 drawn from the New Zealand specimen, since it does not agree in all 

 respects with Dusen's material. 



The plants in the Mitten Herbarium are very fragmentary and grew 

 in a loose depressed mat in admixture with other bryophytes. The 



