INDEX TO AMERICAN BOTANICAL LITERATURE 
1920-1922 
The aim of this Index is to include all current botanical literature written by 
Americans, published i in America, or based upon American material; the word 
merica being used in the broadest sen 
Reviews, and papers that relate s ciaatile to foresty, pe horti- 
culture, manufactured products of vegetable origin, or laboratory methods 
are not included, and t { backettoloey. 
An occasional exception is made? in favor of some paper appearing in an Ameri- 
can periodical which is devoted wholly to botany. Reprints are not mentioned 
unless they differ from the original in some important particular. If users 
of the Index will call the attention of the editor to errors or omissions, their 
kindness will be appreciated. 
This Index is reprinted monthly on cards, and furnished in this form to 
subscribers at the rate of three cents for each card. Selections of cards are 
not permitted; each subscriber must take all cards published during the term 
of his subscription. Correspondence relating to the card issue should” Be 
addressed to the Treasurer of the Torrey Botanical Club. 
Horne, W. T. A phomosis in grape fruit from the oF of Pines, 
Wiest] I[ndies], with notes on Diplodia natalensis. _Phyto- 
pathology 12: 414-418. pl. 26, 27 +f. 1. 17 O 1922. 
Hovey, E. O. A tree fern of Middle Devonian time. Nat. 
Hist. 22: 458-460. O 1922. 
Howard, N. O. The control of sap-stain, mold a ene 
decay in green wood with special reference to valuable 
stock. U.S. Dept. Agr. Bull. 1037: 1-55. f. 1-26. 19 Au 
1922. 
Howe, M.A. Twonew {iuethanianae. calcareous Algae, eet 
the lower Miocene of Trinidad, British West Indies. Proc. 
U. S. Nat. Mus. 62: 1-3. pl. 1-4. 1922. 
Howe, M A., & Hollick, A. A new American fossil hepatic. 
Bull. Torrey Club 49: 207-210. f. 7. 10 Au 1922. 
Jungermanniopsis, gen. nov. 
Howe, T.D. A preliminary notice concerning the development 
of the embryo-sac in Grindelia squarrosa (Pursh) Dunal. 
Proc. Nebraska Acad. Sci. 5: 116. 1922. 
219 
