Synopsis under the name, Cladonia iitrgida (Ehrli.) Holfm. var. coiispiatci 

 (Schaer.) Nyl. Addit. Fl. Chil. 147. 1S55. The primary thallus is usually 

 wanting, the podetia elongated and sometimes quite squamulose. 



In closing some explanation of a few expressions used above will be 

 helpful. Our sea-green is a grayish green or perhaps nearer a gray than a 

 green. Single cells or hyphae which are hyaline, when seen collectively as 

 in an hymenium or an hypothecium, are of a whitish color, which we have 

 called pale. Paraphyses of Cladonias are hyaline except at the tips. 



Even water will sometimes causes the coloring matter of the epithecium 

 to diffuse through the hymenium, especially the upper portion, in sections. 

 To avoid error from this source, sections must be examined as to color the 

 moment after cutting. Fayette, Iowa. 



HEPATICS LEJEUNEA. 



William C. Barbour. 



T 2 3 4 5 6 



Fig. I. Archilejeunea clypeata Fig. 2. A. Sellowiana Fig. 3. Lejeunea 

 Americana Fig. 4. Microlejeunea lucens Fig. 5. M. Ruthii Fig. 6. Colo- 

 lejeunea Jooriana 



The genus Lejeunea was founded by Libert, and as such was accepted 

 by Spruce and many other writers. If considered as a single genus it is a 

 very large one, and was divided by Spruce into thirty-seven subgenera. 

 Most of these were raised to the rank of genera by Schiffner when, in 1893, 

 he issued the Hepatic part of Engler and Prantl's Natur Pflanzenfamilien. 



We shall endeavor to adapt from older works a description of the genus 

 which shall cover the composite Lejeunea as covering all these divisions. 

 The descriptions of species are adapted and simplified from the monograph by 

 A. W. Evans, of Yale University, published in Volume VIII., No, 2, Memoirs 

 of the Torrey Botanical Club. Most of the illustrations were redrawn from the 

 same source. Dr. Evans admits to the flora of the United States and Canada 

 twenty-three species, of which about ten occur in the "Gray's Manual Region." 



Of the thirteen species not here included, seven are found in various 

 States of the South, including Florida; five in Florida only : and one, Colele- 

 Jeunea Maeoiniii {'^^vu.ce) Evans, occurs in British Columbia. Of the species 

 here noted, one, Lejeitnea patens Lindb. is found in Newfoundland and 

 Nova Scotia. The other occurs at various points in the Northeastern States. 



In temperate regions the number of species found is comparatively 

 small, while in the tropics the genus reaches proportions which are alarm- 



