ENDOTROPHIC MYCOKHIZA. 99 



or wood, possess endotrophic mycorhiza. These appear as fine, 

 elongated rootlets whose epidermal cells never develop as root- 

 hairs, but become filled with coils of fungoid hyphae. 



Schlicht mentions a large number of herbaceous plants out of 

 the most widely separated genera of Angiosperms, the finer roots 

 of which he found regularly developed as mycorhiza. These, how- 

 ever, possess in addition normal root-hairs, which without doubt 

 function as such. The endotrophic coils of fungi are situated in 

 the inner cells of the cortex surrounding the conductive tissues, 

 and Schlicht regards them as important in transmitting to the 

 conducting tissues substances taken up by the root-hairs. Since, 

 however, the fungus inhabits living cortical cells, it is quite 

 possible that these transmit the food-materials direct without 

 the aid of the fungus. 



Schlicht found endotrophic inycorhiza on Leguminosae, while 

 Frank found them on the alder, both being distinct from the 

 well-known tubercles of these plants. 



Kiihn^ and GoebeP found endophytic root-fungi on Marat- 

 tiaceae, Ophioglosseae, and Zycopodium ; Kiihn also found spores 

 which resembled those of Schinzia. 



Endotrophic mycorhiza are also present in saprophytic green 

 orchids, as well as in hemi-saprophytic orchids without green 

 colour; and Meineke^ found hyphae passing through the little 

 cells of the endodermis of the aerial roots of orchids into the 

 mucilage-masses of the rind-parenchyma. Schimper found fungi 

 present on the adherent side of the roots of epiphytic orchids. 



Mycodomatia of Myricaceae, Elaeagnaceae, and the 



Alder.* 



The above-mentioned plants possess a well-developed and 

 normal root-system, and also characteristic lateral outgrowths, 



' Kiihn, " Untersuchungen ub. d. Aiiat. d. Marattiaceen, " Flora, 1889. 

 ^ Goebel, Botan. Zeitung, 1887. 



>* Meineke, "Beitr. z. Anat. d. Luftwurzeln d. Orchideen,'' Flora, 1894. 

 '' Bibliography — Woronin, Mem. de I'acad. des sci. de St. Petersburg, 1866. 



Brunchorst, Ber. d. deutsch. botan. Ges., 1885. 



Brunchorst, Unters. aus d. hotan. Inst. Tubingen, 1886. 



MoUer, Ber. d. deutsch. botan. Ges., 1885 and 1890. 



Frank, Ber. d. deiUsch. botan. Ges., 1887 and 1889. 



Atkinson, " The genus Frankia in U.S. America," Torrey 

 Club Bulletin, 1892, p. 171, with plate. 



