Form of Hormidium fiaccidum , A. Braun. 523 
4. Aplanospores. 
As appears in other sections of this paper, the Woodford form of 
Hormidium fiaccidum has been grown under many different external 
conditions. Yet, apart from splitting, the only method of reproduction 
observed was the formation of aplanospores. The treatment by which 
Fig. 4. A-K, stages in the production of free aplanospores. A, contraction of chloroplast to 
centre of cell, b, c, d, protoplasm contracted round chloroplast. E, development of surrounding 
membrane before liberation. F, G, liberation of aplanospore. H, empty parent cell, with aperture 
in wall. I, free aplanospore. J, aplanospore with surrounding wall. K, first stage in germination. 
L, cell showing distribution of refractive granules and masses in superficial protoplasm. M, customary 
distribution of granules, when numerous, n, granules arising in the vacuoles, p ., protoplasm; 
zo., cell membrane; other lettering as in Fig. i. (a, b, d x 1,750; c, E x 1,360; f-k, n X900; 
L x 1,500 ; M x 1,000). 
Klebs 1 obtained zoospores in another form ot H . fiaccidum , viz. transference 
of threads from a nutritive solution into water in darkness, has not proved 
successful with this form. 
The aplanospores of H. fiaccidum have only been described in forma 
typica , where they are rounded and have a spinous wall resembling a 
1 h c., p. 343- 
N II 
