but we have it also from Australia. Xo form is known in Europe. 

 Tylostoma minutum is. in my opinion, based on a small specimen of it. 

 It varies in two features, color and roughness of the spores, and plants 

 so varying have been called species, but to my mind they are so close, 

 that they may better be called forms. 



SPECIMENS IN OUR COLI.ECTIOX. 



Nebraska, Rev. J. M. Bates. 



Colorado, E. B. Sterling (four collections). 



FORMS OF TYLOSTOMA POCCLATUM. 



TYLOSTOMA TUBERCULATUM (Plate 83). We find specimens agree- 

 ing with Tylostoma poculatum in general characters, and so close to it they can 

 not be distinguished except by the microscope, that differ in having spores not 

 smooth, but granular. For us it is a form, but for those who give their species 

 no latitude as to spore variation it is a strong species. We are not sure it is Miss 

 White's plant, as we would describe the spores as "granular" instead of with 

 "occasional tuber-like warts." but we prefer to use her name rather than to 

 propose a new one. 



SPECIMENS IN OUR COLLECTION. 



Washington, C. V. Piper. 

 Illinois, A. S. Bertolet. 

 Texas, W. H. Long. 



TYLOSTOMA SUBFUSCUM (Plate 83). The usual color of Tylostoma 

 poculatum is pale tan but sometimes collections are dark chocolate brown. Some- 

 times both colors occur in same collection and I have noted all shades of con- 

 necting colors. The extreme color form, however, is very marked. Spores are 

 granular in all we have examined. 



SPECIMENS IN OUR COLLECTION. 



Nebraska, Rev. J. M. Bates. 



Minnesota, Minn. Bot. Survey. 



Florida. C. E. Pleas (two collections), Theo. L. Mead (a very small form). 



We have this exact plant also from Australia. Prof. D. McAlpine. 



TYLOSTOMA LLOYDII (Plate 83). Peridium dark, reddish- 

 brown, with a thin, closely adnate cortex, which separates perfectly 

 above but persists closely adnate at the base. Mouth at first raised, 

 shield-shaped, fibrillose, In old specimens these fibrils are worn away, 

 leaving the mouth a naked, round, plane opening. f Stem long, slender, 

 with a dark, scaly cortex.J Capillitium slightly colored, subhyaline, 

 narrow threads with slightlv thickened nodes. Spores smooth, 4 mic. 



This is apparently a very rare and local form but is strongly dif- 

 ferent from any other species known to me. Prof. \V. H. Aiken col- 

 lected the plants several years ago in the vicinity of Cincinnati. ( )hi<>, 

 and brought the specimens to me. I sent some to Rev. Bresadola who 

 decided it to be undescribed and published it recently (Ann. Myco- 



h f Ti!? e . fisure r . in Petri's paper was made from an old specimen and do.-s not 

 show the true character of the mouth. 



t The only collection known was old. wintered specimens and the stem scales 

 e small, but I think fresh specimens will be found to have a strongly scaly si. in. 



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