388 A. W. Evans — Haioaiian Hepaticm of the Tribe Juhuloideae. 



his plants to Professor D, C, Eaton, who forwarded sample-specimens 

 of them to Mr. Austin for determination. Austin described several 

 of the new species from this collection in 1879 and left several 

 othei's in manuscript. In 1892, the present writer compiled a provi- 

 sional list of the species from the Islands, based upon Baldwin's 

 collection and depending largely on the determinations made by 

 Austin. 



In 1896 Herr Stephani described two of Goltsche's manuscript 

 species from specimens collected by Didrichsen, and in the follow- 

 ing year, published a revised list of the Hawaiian Hepaticae, adding 

 several new species from the collections made by Mr. A. A. Heller 

 in 1895, and several others from specimens in the herbaria of Drs. 

 Askenasy and Spruce. He also ascribed the various Lejeuneeae to 

 their respective genera, as these are at present understood. 



During the summers of 1897, '98 and '99, large and important 

 collections were made by Mr. C. M. Cooke, Jr., mainly on the 

 islands of Oahu and Kauai. These collections have brought to light 

 several new and interesting species and have added much to our 

 knowledge regarding the distribution of forms previously known. 

 Mr. Cooke's specimens have furnished the material for most of the 

 descriptions and illustrations in the present paper. 



Even now, however, our knowledge of the Hawaiian hepatics is 

 doubtless far from complete : the collections of recent years have 

 been made almost entirely on the islands of Oahu, Maui and Kauai, 

 and we know little more about the species growing on the large 

 island of Hawaii than was known fifty years ago. From the island 

 of Molokai also, which seems favorable for these plants, only three 

 species have been reported. It is quite possible that a systematic 

 collection on Hawaii and a careful search on the other islands, par- 

 ticularly for the minuter forms, would more than double the number 

 of species which we now know. 



The present j^aper includes a part only of the leafy Hepaticae, the 

 Jubuloidese of Schiffner. In its preparation, I have been able, 

 through the kindness of correspondents and the curators of herbaria, 

 to examine the original specimens of nearly all of the Hawaiian 

 species. Those who have given me the most assistance and to whom 

 I would express my grateful acknowledgments, are the following: 

 Mr. W. H. Pearson, Professor A. G. Nathorst, Mr. William Mitten, 

 Herr F. Stephani, Professor Victor Schiffner, Mr. W. B. Herasley, 

 Dr. P. Hennings, Professor L. M. Underwood and Mr. A. Gepp. 



