Summary
Hypoxylon stygium (Lév)Sacc.,H. archeri Berk.,H. bovei Speg. var.microspora Miller,H. truncatum (Schw.ex Fr.)Miller,H. nummularium Bull. ex Fr. var.merillii Miller (=Hypoxylon asarcodes (Theissen)Miller?) andH. deustum (Hoff. ex Fr.)Grev. (=Ustulina zonata (Lév.)Sacc.), occurring in the tea gardens of Assam are illustrated and described. In addition, the following species ofHypoxylon hitherto reported from this country are enlisted:H. multiforme Fr. (=H. atropurpureum Fr., =H. hookeri Berk.)H. fragiforme (Pers. ex Fr.)Kickx. (=H. coccineum Bull.),H. rubiginosum Pers. ex Fr. (=H. fusco-purpureum (Schw.)Berk. et Curt., =H. nectrioides Speg., =H. perforatum Schw. ex Fr.),H. hypomiltum Mont.,H. indicum (=H. haematostroma Mont.? =H. distillatum Berk. et Fr.),H. investiens (Schw.)Curt.,H. crocopeplum Berk. et Curt. (=H. ochraceo-flavum Berk. et Cooke),H. pistillare Pers. ex Fr.,H. haematostroma Mont. (=H. vividum Berk. et Br.).H. jecorium Berk. et Rav. (=Nummularia cinnabarina P. Henn.),H. suborbiculare (=Nummularia suborbicularis (Welw. et Currey() =H. sclerophaeum Berk. et Curt? Sacc.),H. truncatum (Schw. ex Fr.)Miller (=H. annulatum (Schw.)Mont.) andH. stygium (Lév.)Sacc.
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References
Agnihothrudu, V. (1963) A concise key for the identification of primary root rots of tea in North-east India.Two and A Bud (in the press).
Ellis, J. B. &Everhart, B. M. (1892) The North American Pyrenomycetes. New Field, N. J. pp. 793.
Miller, J. H. (1961)A Monograph of the World Species of Hypoxylon, Univ. Georgia Press, Athens, U.S.A. XII + 158 pp.
Sarmah, K. C. (1960) Diseases of tea and Associated crops in North-east India. Memorandum No. 26,Indian Tea Ass., VII + 68 pp.
Tunstall, A. C. (1940) Notes on root diseases of tea in North-east India. Memorandum No. 8.,Indian Tea Ass., 25 pp.