302 Alexander W. Evans, 



In the Synopsis Hepaticarum emphasis is again laid on the 

 receptacles. The female receptacle is said to be excentric, hemi- 

 spherical, and about five-lobed, the lobes being obtuse, subcrenate 

 and soon obsolete, with hyaline, denticulate involucres. The male 

 receptacles are said to be unsymmetrical and palmately four- to 

 five-parted. This account of the female receptacle agrees closely 

 with that of Raddi and differs from that of Taylor. Both writers, 

 however, are cited under the species. From Brazil several 

 localities are enumerated, but the only West Indian stations given 

 without question are on the island of Martinique. The Synopsis 

 quotes three synonyms: M. androgyna (female plants only), 

 M. Swartzii, and Chlamidium indicum. These may be considered 

 in order. 



Swartz apparently supposed that what he called M. androgyna 

 was the same as M. androgyna L.,*'^ a species based on two cita- 

 tions, the first from Dillenius*^ and the second from Micheli.** 

 According to Swartz, who treats the plant very briefly, M. 

 androgyna is related to Rehoulia hemisphaerica (L.) Raddi; he 

 describes the thallus as narrower than in that species and states 

 that the male receptacles are perhaps sessile and that the female 

 receptacles are subentire. Although he cites no actual material 

 it is probable that he drew his description from Jamaican speci- 

 mens collected by himself, these being definitely referred to by 

 later writers. 



Now the Dillenian species quoted by Linnaeus under M. 

 androgyna has been the cause of a great deal of confusion. It 

 was based on two entirely different plants, a fact which was first 

 pointed out by Lehmann and Lindenberg in their discussion of 

 the Asiatic M. linearis Lehm. & Lindenb.^° They show clearly 

 that the Dillenian /. ^B, which, as they state, is essentially the 

 same as the figure by Micheli, represents Grimaldia dichotoma 

 Raddi, a common species of the Mediterranean region. They 

 show further that the Dillenian /. ^A and /. jC represent a species 

 of Marchantia, and they suppose that this species is the same 

 as the M. androgyna of Swartz. The two figures in question 

 were drawn from specimens collected in Jamaica by P. Collinson ; 



*^Sp. Plant. 1138. 1753. 



^ Hist. Muse. 520. pi. 75, f. 3. 1741. 



^ Gen. Nov. Plant. 3. pi. 2, f. 3. 1729. 



■^Lehmann, Pug. Plant. 4:9. Hamburg, 1832. 



