524 Mas see. — On Trichosphaeria Sacckari , Mass.; 
but which resembles in many points the formation of 
hormogonia in some of the lower Algae, as described and 
figured by Bornet and Thuret 1 ; in this instance, however, the 
concatenate cells forming a hormogonium are completely 
formed within the mother-cell, escaping from its ruptured 
apex at maturity. 
Amongst Fungi, I have observed an exactly similar mode 
of conidial development in Milowia nivea , Mass. 2 , and 
Sporoschisma mirabile, B. & Br. 3 ; it is also evident from 
the description and figures given by Halstead and Fairchild 4 
of Ceraiocystis fimbriata , Ell. & Hals., a fungus causing 
black rot in the sweet potato, that the two forms of conidia 
present, correspond in structure and origin with the macro- 
and microconidia of Trichosphaeria Sacchari , and although 
the ascigerous stage of the Ceraiocystis has not yet been 
discovered, the close agreement between the conidia in the 
two species suggests affinity. 
When the conidia-bearing branches of the Trichosphaeria 
become swollen, the cell-wall becomes bright blue at the apex 
when treated with a solution of iodine, resembling in this 
respect the asci of many of the Discomycetes and other 
ascigerous fungi. No trace of nuclei, as morphologically 
understood, could be detected in the mother-cell nor in the 
conidia during any stage of development ; it is true that 
a number of points in the mother-cell, and one in each 
conidium, became coloured with those reagents that differen- 
tiate nuclei, but it appears to me rather doubtful in all such 
cases as to whether such apparently structureless particles are 
the equivalents in function of true nuclei, whatever that 
function may be. 
Inoculation of healthy canes with macroconidia yielded the 
following results. 
Expt . I. Placed on the basal part of the upper surface of 
1 Notes Algologiques, Plates III, XXX, XXXVII, and XXXVIII. 
2 Journ. Roy. Micr. Soc., v. 4, ser. 11, p. 841, PI. XII. 
3 Berk., Intr. Crypt. Bot., Fig. 74 a. 
4 Journ. Mycol., Vol. vii, p. 1, PI. I— III. 
