THE THALLOSE IIEPATICAE OK THE JUAN FERNANOEZ ISLANDS 555 



The species was based on specimens collected by Herteko in 1830 on 

 Masatierra, no more definite locality being mentioned; it has since been col- 

 lected, presumably on the same island, by MOSEI.EY and by HASTINGS (see 

 Evans, 248). 



Area of distribution: Argentina, Chile, Juan Fernandez, and I'alkland 

 Islands; St. Helena and Cape Colony; Australia, Tasmania and New Zealand: 

 apparently restricted to the Southern Hemisphere. 



*6. M. foliacca Mitt, in HooKEK, J. U., Flora Nov. Zeland. 2: 168(1855). 

 On soil and rocks, often in wet localities. (Fertile Dec. to Feb.). 



Masatierra: Pangal, waterfall and on stones in a spring, 205 m. (no. 17); 

 O. Damajuana, waterfall in the forest, 248 m. (no. 18). 



Masafuera: Q. del Mono, on the ground in a narrow gorge, 570 m. (no. 

 19); Q. de las Casas, Skottsberg, 1908 (no. 27). 



Although this interesting species is here reported for the first time from 

 Juan Fernandez, it was collected by Skottsherg in 1908, as noted above, and 

 listed by Stephani under the name M. cephaloscypha (see Stephani, 5). 

 According to a specimen in the herbarium of the University of Upsala, M. 

 foliacca was collected still earlier in 1 908 by T. HallE at Quicavi on the is- 

 land of Chiloe. This specimen was listed by Stephani as M. Notarisii Lehm., 

 a name which M. foliacca antedates by two years. 



In the Mitten Herbarium (now belonging to the New York Botanical Garden) 

 there are two sheets in the J/, foliacca cover with specimens from New Zea- 

 land, one with specimens from Tasmania and Australia, and one with a specimen 

 from the Solomon Islands. Among the New Zealand specimens are several 

 collected by W. CoLENSO and by J. JOLLIFFE, and it was from these that the 

 original description was presumably drawn. Unfortunately these early specimens 

 represent two species, making it necessary to designate one as the type. 

 The writer therefore suggests that CoLENSO's No. 2070 be so designated. 

 This species is the better developed of the two, it agrees best with Mitten's 

 description, and it shows fairly well developed female receptacles. The spec- 

 imens from Juan Fernandez and Chiloe agree closely with this specimen and 

 the same thing is true of a specimen from Tasmania collected by Archer. 

 The specimens from Australia and the Solomon Islands clearly belong elsewhere. 

 Other New Zealand specimens in the Mitten Herbarium, which should be 

 referred to the true M. foliacca, were collected by MoSSMAN and Kerr, 

 while several additional collectors are cited by Stephani in his Species Hepat- 

 icarum. 



The present species belongs to the section Chlamidiuni, characterized by 

 the flat or merely convex rays of the female receptacle. In this respect it 

 stands in sharp contrast to M. polyvwrpha and M. Bertcroana, both of which 

 have terete rays and belong to the section Astromarchantia. The receptacle 

 of M. foliacca is usually flat and almost circular in outline, measuring about 

 1 cm. in diameter when well developed. The rays are normally nine but may 

 be as few as seven or as many as eleven. At their broad and truncate extrem- 

 ities they are decidedly leaf-like in appearance, as the specific name implies. 



