342 



LYCOPODIALES 



that the general plan of construction of the prothallus is the same as in 

 the L. cenii/i/m-typQ, but modified in accordance with the saprophytic 

 method of nutrition. 



'-> -v-v u-^j-^^^^yfjj^rsSff. 







v :: -"^'^Kry, .-, 



jQgHWVVW^ ^ _-> '"',;- 



UK/jJ , 



-VAJ^^..: -v. 



W^^fe^fe 



SsS^&^S i" 



:. 



' 

 ^M. . . r'vyvi^' 



I'll,. 179. 



/J =old prothallus of Lycofioiiiiun attnotinuiii, L. , with young plant projecting beyond 

 the earth-surface (o). Natural size. 5 = median section through a young prothallus of 

 Lycopodhtin clavatitin. L. x about 30. C = part of this from the middle region of the 

 upper surface, with antheridia in different stages. X 52. /J = part of the margin of the 

 median section, with meristem and jircliegunia. X 52. i: = the ejiidermis devoid of 

 fungus, with rhi/oids ; >- = cortical layers, with their cells filled by hyphal coils ; / = the 

 palisade layer, also filled with hypha; ; j/ = the storage tissue; ; = the meristem; 

 a=amheridia; rtrM = archegonia ; em = nn embryo ; fits foot; ; = its root. (After 

 Bruchmann, from Engler and IVmtl.) 



In the third type, exemplified by /,. phlegmaria and other epiphytic 

 species, the prothallus is more attenuated, and repeatedly branched. The 

 delicate colourless branches extend widely through the dead bark on 



