Friesia X, 4-5

- 263-
brown, 78-182 u . Pycnospores cylindrical, rounded at the ends, hyaline,
1-3 (usually 3) septa, 17-28 X 2.8-4.0 u . Perithecia subepidermal,
globose, with a short papillate ostiole, dark brown to black, 100-240,u
in diameter. Asci cylindrical to clavate, bitunicate, 8-spor ed, 51-80 X
9-12 u , Ascospores biseriately arranged, straight or slightly curved,
3-sept at e, constricted at the septa, often with the second cell from
apex somewhat enlarged, light brown, 19-28 X 4.4-5.6 u ,
Imperfect stage: Septo ria nodorum (BERK.) BERK. & BR. f. sp .
hordei f. sp. nov.
Type specimens have been deposited in the Herbarium of the
Department of Plant Pathology, The Royal Veterinary and Agricultural
University, Copenhagen, and at the Centraalbureau voor
Schimmelcultures, Baarn, Holland.
The formation of t he new infraspecific taxon Leptosphaeria nodorum
MULLER f. sp. hordei requires (International Code of Botanical
Nomenelat ure 1966, art 25 and 26) that Leptosphaeria nodorum
MULLER which eauses glume blotch of wheat is also given the taxonomic
rank of a [orma specialis as follows:
Leptosphaeria nodorum MULLER f. sp. nodorum. Imperfect stage:
Septoria nodorum (BERK.) BERK. & BR. f. sp. nodorum. The nomenclatural
type of this fungus is Leptosphaeria nodorum MULLER.
ACKNOWLEDGEMENTS
The author wishes to thank Professor E. HELLMERS, head of Department
of Plant Pathology, for vaulable criticism of the manuscript, and is
also indebted to Civil Engineer E. BROCKMEYER for the Latin translation
of the diagnosis of L eptosphaer ia no dorum f. sp. hordei.
The investigations were supported by the Danish Agricultural and
Veterinary Research CounciL
REFERENCES
Berkeley, M. J. (1845): Disease in the wheat crop. - Gard. Chron.: 60l.
& C. E. Broorne (1850): Notices of British Fungi. - Ann. Mag.
Nat. Hist., 2. Ser., 5: 365-380.
Boererna, G. H., H. A. van Kesteren & M. M. J. Dorenbosch (1964): Nieuwe
af bijzondere schimmelaantastingen. - Jaarb. VersL Meded.
Pl.ziektenk. Dienst. 142: 64-66.
C.M.I. (1954): Distribution maps of plant diseases, no. 283 .