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THE JOURNAL OF BOTANY 



fungus, though Saccardo remarks that one is "longe diversa " 

 from the other. It is possible by choosing one's specimens to 

 distinguish the latter as : — 



Spots smaller, darker, tending towards brownish on both sur- 

 faces ; hyphse amphigenous ; conidia cylindrical, 1-4 septate, 4-6 /x 

 broad, as much as 50 /x long. 



I have found a Bamularia answering to this description on 

 Primrose leaves at Olton, Four Oaks, Bewdley, &c., but all stages 

 are to be met with between the two extremes. See No. 154. 



150. AcROSTALAGMUS ciNNABARiNus Corda, Sacc. Syll. Fung, 

 iv. 163 ; Mass. Fung. Fl. iii. 331. 



On decaying stems of Helianthus tuberosus I found, in Sep- 

 tember, large patches of this fungus perfectly formed, and in other 

 parts small tufts of Verticillium lateritium Berk. (Fung. Fl. p. 330). 

 Moreover, one could find every possible stage between the two ; 

 and I have watched the gradual growth of a tuft of the Verticil- 

 lium and seen it pass into a perfect Acrostalagmus. This experi- 

 ence has, in fact, been repeated several times on different occasions, 

 and there can be no possible doubt that Berkeley's F. lateritium 

 is only a young stage of the Acrostalagmus. 



151. Trichothecium obovatum Sacc. Syll. Fung. iv. 179 ; 

 Mass. Fung. Fl. iii. 337. 



It is absolutely certain that this is merely the young stage of 

 T. roseum Link. I have watched the growth of specimens of this 

 fungus many scores of times, and seen the gradual transition from 

 one to the other. One can see a single spore produced at the 

 apex of the conidiophore, but in such cases it is always obliquely 

 placed, not central and terminal ; soon another grows, also 

 obliquely placed, and on the opposite side to the first one ; then 

 three arranged like a trefoil, and occasionally four. At first the 

 w^hole fungus is white, but when older it assumes a beautiful rosy 

 tint, the colour, however, being most marked in the mycelium, the 

 conidia are often but faintly coloured. 



Moreover, I can see no real difference between these and 

 Cephalotliecium candidum ; the latter name could be applied 

 accurately when a specimen has developed four conidia at its apex, 

 but has not yet assumed the rosy colour, as occasionally happens. 

 The differences in the dimensions given for the spores easily fall 

 within the limits shown by a single tuft, viz. from 14 x 6 /x to 

 19 X 10 /x. When rosy, this becomes C. roseum. 



23. Arthrobotrys oligospora Fres. Beitr. t. iii. f. 1-7 ; Sacc. 

 Syll. Fung. iv. 181. See Journ. Bot. 1884, p. 198, t. 246, f. 3. 



Conidia few together, obovate, 30 x 15 /x or more ; hyphae 

 forming a white stratum, at the base of an old Angelica stem, 

 Alvechurch (Ws.), May. 



Saccardo considers this as a variety of A. superba Corda, which 

 may well be true. It is also stated that A. oligospora is some- 

 times rosy, and Harz maintains that Arthrobotrys is only a more 

 highly developed form of Trichothecium, which is also possible. 

 (See remarks on the preceding species.) If these suggestions are 



