Evans: TAXONOMIC STUDY OF DUMORTIERA 177 
Upper surface of thallus smooth or nearly so throughout ae: 
often showing vestigial air chambers). . D. hirsuta. 
Upper surface of thallus with crowded papilliform cells, at least in 
certain portions (always showing vestigial air chambers). 2. D. nepalensis. 
I. DUMORTIERA HIRSUTA (Sw.) Nees 
Marchantia hirsuta Sw. Prodr. Fl. Ind. Occid. 145. 1788. 
Dumortiera hirsuta Nees, Nova Acta Acad. Leop.-Carol. 12: 410. 
1824. 
Marchantia irrigua Wils.; Hooker, Brit. Fl. 2: 106. 1833. 
Hygropyla irrigua Tayl.; Mackay, Fl. Hibern. 2:54. 1836. 
Dumortiera irrigua Nees, Naturg. Europ. Leberm. 4: 159. 1838. 
_?Dumortiera hirsuta angustior G. L. & N. Syn. Hep. 544. 1846. 
?Dumortiera hirsuta intermedia G. L. & N. I. c. 
?A skepos brevipes Griffith, Not. Pl. Asiat. 2: 340. 1849. 
Dumortiera hirsuta irrigua Spruce, Trans. Bot. Soc. Edinb. 15: 
566. 1885. 
It seems unnecessary to give a list of the many specimens 
which the writer has referred to D. hirsuta. They represent a 
very extensive geographical range, for the most part tropical, 
and include a few sterile and poorly developed plants, which are 
not altogether above suspicion. This is especially the case when 
such plants were found in regions where D. nepalensis also occurs. 
The specimens examined came from the following states, countries, 
and islands: Pennsylvania, North Carolina, South Carolina, 
Kentucky, Tennessee, Georgia, Florida, Alabama, Missouri, 
and Arkansas; Mexico, Guatemala, Nicaragua and Panama; 
Bermuda; Cuba, Hispaniola, Jamaica, Porto Rico, Montserrat, 
Guadeloupe, Martinique and Grenada; Colombia, Peru and 
Bolivia; Venezuela, Brazil and Paraguay; Ireland, England 
(East Sussex) and France (Hautes-Pyrénées); Madeira and the 
Canary Islands; Fernando Po and Kamerun; China, India (in- 
cluding Nepal and Ceylon), French Indo-China and Japan; the 
Philippine Islands, Java and the Hawaiian Islands. 
It has unfortunately been impossible to secure the actual type 
specimen of Marchantia hirsuta for examination. The specific 
name “hirsuta” is here associated with the form without surface 
papillae, because a Swartzian specimen in the British Museum 
(kindly examined by Mr. Gepp) is smooth and because the 
