60 



of the spores (Plate IX and X) and the colour of the cultures. 



Fusarmm spores. In all strains the Fusarium spores were 

 dorsiventral, slightly incurvate, narrower at both ends, bott- 

 leshaped at the top and with a distinct foot. As to that they 

 were quite the same. The dimensions and the number of septa 

 however showed constant differences between the two groups. 



Tlie iirst group, including the strains IV, VIII, IX, X, XI 

 and XTI (Plate IX, fig. 2—7) has spores measuring 60 — 90 X 

 4 — 7 mikron, with 6 — 9 septa. These are identical with Fusa- 

 rium {Spicarla) colorans de Jonge (Plate IX, fig. 1) '). 



The second group, including the strains I, II, III, V, VI, 

 VII, XIII, XIV and XV (plate X, fig. 2- 10) has spores mea- 

 suring 30 — 60 X 3 — 5 mikron, with 4 — 6 septa. These are 

 identical with Fusarium theohromae Appel et Strunk (Plate X, 

 fig. 1)^). 



Colour. Growth and development of the pure cultures of 

 both groups were the same; neither showed the mycelium any 

 constant difference. The colour however did, but it changed 

 also with the age of the cultures. Whenever a series of all 

 strains was inoculated on boiled rice, taking the circumstances 

 as equal as possible, there was a marked difference between 

 the two groups, so that it became quite easy to distinguish 

 the forms with the larger spores by their colour. 



The 6 strains belonging to Fusarium. colorans were always, 

 on bread as well as on rice, yellow, pink or red, the 9 strains 

 of Fusarium theohromae greyish, olive-coloured or greenish- 

 black. The colour of Fusarium colorans was different nn alcaline 

 and acid mediums. On acid rice or bread, cultures of 1—4 

 weeks old were clear yellow, on alcaline rice or bread pink. 



1) Hall-de Jonge, Mevr. A. E. van, Ranker of Roodrot van den cacaoboom ver- 

 oorzaakt door Spicaria colorans n. sp. Bull. 20 Dep v. L. Suriname 1909 English 

 translation in: Rec. des Travaiix bot. Neeil Vol. VI, 1909. 



2) Appel, 0. und Strunk, II. F., Ueber einige in Kameriin auf Theobronia Cacao 

 beobachtete Pilze. Centralbl. f. Bakt. 2^ Abt. XI, 1904, p. 032. 



Appel, 0. und Wollenvvebf.r, H. W., Grundlagen einer Monographie der Gattung 

 Fusarium (Link). Arb. a. d. Kais. Biol. Anstult f. Land- und Forstwirtscliaft. 

 Berlin 1910. 



