A SUPPLEMENT TO THE PTERIDOPHVTES AND PHANEROGAMS OF JUAN FERNANDEZ 78 I 



but a much larger material from both islands is required in order to know if a 

 special insular form or variety should be distinguished. 



Acaena argentea Ruiz et Pav. X Margyricarpus digynus; Margyracaeyta 

 Skottsbergii liittcr ex SkoTTSH. 3. 134. 



A comparative anatomical study of Margyracaeua and its supposed parents 

 by Miss ASTRID RlXDE (Mrs. Wai.I.ERIIs) has confirmed the opinion on its origin 

 expressed by Bitter and the author. 



71. Fagara externa Skottsb. 3. 143, 5. 170. 



Add Masafuera: C. Ruiz S. (fr. Oct. 1927! Herb. Looser). 



~2. Dysopsis hirsuta (Muell. Arg. ut subsp.) n. sp. D. glechonioides {R\c\\.) 

 Muell. Arg. subsp., Skott.'^B. 3. 144. 



The insular form difters from both mainland forms (which, I believe, ought 

 to be recognized as species) in so many characters that I have raised it to specific 

 rank. 



^Callitriche marginata Torrey \ ar. Lechleri Hegelm. C. stagnaiis, Skottsb. 

 3. 220. 



In 1922 this was published as C. stagnaiis on the authority of the late prof. 

 G. Samuelssox and regarded as adventitious. Later Samlels.sox renamed my 

 material C. Diarginata, a North American species, var. Lechleri Hegelm. The 

 variet}' is widespread in Chile where, undoubtedh'. it is indigenous, and it may 

 well have reached Masatierra without the aid of human traffic. 



73. Empetrum rubrum \'ahl. Skottsb. 3. 145. 



R. Good suggests 1. c. 511 that my plant from Masafuera, and one specimen 

 from Fuegia, belong to riibrian subsp. Eauiesii (Fern, et Wieg.) R. Good, other- 

 wise known only from E. Quebec, Labrador and Xew Foundland, a form with 

 pubescent stem, glabrous leaves and pale red, translucent berries, differing from 

 both rubruvi var. atropurpuretmi (Fern, et Wieg.) R. Good and the Arctic nigrum 

 f. piirptireiim (Raf.) R. Good. The principal difference between nigrum and 

 rubrum is, according to GoOD, that the former has glabrous, the latter pubescent 

 shoots, a rule not without exception. Of the Masafueran form, only a single shrub 

 has been found, without flower or fruit. The leaves are small as in Eamesii, 

 the blade 2.5 — 3 X i — 1.2 mm, but leaves just as small are observed in plants 

 from South America, e. g. in specimens collected by BANKS and SOLANDER in 

 Fuegia; they should be glabrous in Eamesii, but have a tomentose margin, with 

 very long, curly hairs almost as in f. falklandicujti, in the specimen from Mas- 

 afuera. As long as the fruit is unknown, a comparison cannot be made with 

 either Eamesii or any other northern form; at present I can see no good reason 

 to link it with rubrum from the far north rather than with Subantarctic forms. 



74. Colletia spartioides Bert, ex COLI.A. Skottsb. 3. 145 and 5. 158; 

 Texz 1. c. 3: 4. 



Add Masatierra: between B. Cumberland and Pto Frances, Tenz no. 31! 



