3 



r 



1917] 



SPESSARD—PROTHALLIA OF LY COP ODIUM 



75 



Fig. 11 shows in detail the largest sporeling of L. annotinum grow- 



the prothallium represented in fig. 10. The sporeling of 



from 



serves 



possible, 



may obtain still bearin 



It is very 

 figures of 



^podium prothallia given in the various papers upon 



mistake other forms 



The sex organs may 



identification 



20 



21 



Figs. 18-21. Fig. 18, diagram of tissue regions in prothallium of L. clavatum 

 (antheridia and archegonia indicated) ; fig. 19, diagram of median region of prothallium 

 of L. complanatutn, the fungus-infected region being indicated in this and fig. 18 by 

 dotted shading; fig. 20, detailed sketch of fungus-infected region, showing its location 

 beneath the epidermal tissue, X75; fig. 21, single cell with endophytic fungus coiled 

 within (fungus passes freely from one cell to another by piercing the cell wall), X75°- 



them is im 



The number and variety 



confusing. 



appearances to small 



ers which grow in the soil of a wood are be 

 Some of them are surprisingly similar in 



complanatutn 



of L. 



I do not 



threw away some genuine specimens 



appeared to be tubers. I know t 

 even sectioned them in paraffine 

 prothallia. 



and 



