290 Alexander W. Evans, 



half as broad as the other three lobes and the sinus being 

 practically a straight line. The three broad lobes appear to be 

 very shortly incised at the apex but they are actually only emar- 

 ginate, the apparent incision being really filled by an extension 

 of the membranous margin of the lobes. In other respects the 

 lobes agree with Stephani's accounts. The involucre is distinctly 

 toothed, but the teeth are scarcely long enough or sharp enough 

 to be described as cilia or limbriations. The discrepancy in the 

 number of lobes which Stephani's accounts bring out might of 

 course be due to a variability of the species, which could only 

 become evident through the study of more extensive material. 



It is unfortunate that the structure of the stalks of the recep- 

 tacles must be left in doubt. In Stephani's original description 

 the stalk of the female receptacle is said to bear two dilated 

 dorsal lamellae but no mention is made of these in his later 

 account, and nothing whatever is said about the structure of the 

 stalk of the male receptacle. From the scanty supply of material 

 available, it has been impracticable to prepare cross-sections of 

 stalks, so that the writer is unable to confirm Stephani's state- 

 ment or to add further details. If the stalk of the male recep- 

 tacle bears a band of air-chambers the relationship might be with 

 M. domingensis. If two bands of air-chambers are present in 

 the stalk of the female receptacle, a relationship with M. cheno- 

 poda would be indicated, and it is worthy of note that Mitten 

 referred Glaziou's type specimen to M. brasiliensis Lehm. & 

 Lindenb., a species which is now included among the synonyms 

 of M. chenopoda L. According to our present knowledge, how- 

 ever, the systematic position of the species can hardly be 

 determined. 



9. Marchantia chenopoda L. 



Marchantia chenopoda L. Sp. Plant. 1137. I753- 



Marchantia androgyna L. /. c. 1138. 1753 (in part) ; Swartz, 



Fl. Ind. Occ. 1882. 1806. 

 Chlamidium indicum Corda ; Opiz, Beitr. zur Naturg. 647. 1828 



{nomen nudum). 

 Marchantia Swartzii Lehm. & Lindenb. ; Lehmann, Pug. Plant. 



4:9. 1832. 

 Marchantia cartilaginea Lehm. & Lindenb. /. c. 4: 31, 1832. 

 Marchantia brasiliensis Lehm. & Lindenb. I. c. ^: 32. 1832. 



