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No. 135. Two New Gras>es from Van Corllandt Park, New York City. By E. P. 



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No. 136. Sei-ginella rupestris and its allies. By L M. Underwood (1898), 



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No. 137. A Revision of the North American Species of Ophioglossum. by Eliza- 

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No. 138. Studies in the Botany of the Southern United States— XI II. By J. K. 



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No. 139. A new Southwestern Rose. By E. O. Wooton ( 1898), .... 25 cents. 



No. 140. On hypertrophied Scale- Leaves in Pinus ponder osa. By Francis E. Lloyd 



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No. 141. Studies in the Asclepiadaceae — III. By Anna Murray Vail (1898), 



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No. 144. The Study of Botany in High Schools. By L. M. Underwood ( 1898), 



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No. 145. The Genus ^yntherisma in North America. By G. V. Nash ( 1898) 



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No. 146. Notes and Descriptions of North American Plants— I, By J. K. .small 



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No. 147. A Revision of the Genera Chloris and hustachys in North America. By 



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No. 149. Studies in the Botany of the Southeastern United States— XIV. By J K. 



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Title-pages for Vols. I., II., III. IV., and V. can be supplied. 

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Text- Book of General Lichenology 



With Descriptions and Figures of the Genera Occurring in the Northeastern 



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By ALBERT SCHNEIDER, M. S., M.D 



The only modern work on North American Lichens, including a discussion of their 

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Large octavo, 230 pages, 76 full-page plates. Price in paper, net, $3.80; * n cIoth ' 

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