530 



MacDougal : Symbiosis and Saprophvtism 



4 



14. Reinke: Zur Kenutniss des Rhizomes von CoraUorhiza \mdi 

 Epipogon, Bot. Zeit. 56: 145. 1S73. 



15. Thomas: ^\\^ g^xiw^Corallorhiza. Rot. Gaz. 18 : 166. 1893. 



Explanation of Plates 



Pl.ATK 367. (i) Entire specimen of CcphalanlJwra Oregana Reichenb : A, l)ase 

 of aerial stem. (2) rroniorse rliizume of CoraUorhiza Arizonica : A, terminal bud ; 

 B, h\ />\ B, scars of i)receding Luds ; C and D, offsets from which arise coralJoid 

 branches. {3, 4 and 5) Coralloid branches of CoraUorhiza A) honica. (6) Typical 

 specimen of Calypso borealis : A, young conn ; B, corm of previous season's fora^a- 

 tion. (7) Aberrant specimen of Calypso \ A, o\Ci corm with coralloid brancli. (8) 

 Widely aberrant form of Calypso : A, yoimg conn ; /.', old corm with large coralloid 

 bmnch, C. 



Tlate 368. Corallor/u'za ArizoniaiW^ii?,^ (i) longitudinal section of tip of old 

 coralloid mycorhiza : a, a, epidennis ; /;, /., mcdio-cortcx, containing disintegrating 

 branches of fungus ; r, stele ; ;;/, ///, permanent mycelium ; d, d, branches ; e, leaf. 

 (2) Portion of transverse section of mycorhiza : e, epidermis; r, permanent mycelium; 

 w, internal branches in medio-cortcx ; /, naner cortex; /;, phloem; ^, xylem. (3) 

 Cells from cortex: a, a, hyphac of permanent mycelium ; r, masses of hyphae in medio- 

 cortieal cells ; ;;, ;;, ;/, nuclei of cortical cells. (4) IlyaUiode from premorse rhizome. 

 (S) Stomata from coralloitl branch. (6) Section of epidennis of coralloi<l branch 

 showing structure of stoma : e, e, epidermal cells; a, guard cells; ;/, nucleus. (7) 

 Transverse section of aerial stem : e, epidermis ; c, cortex ; d, sclercnchyma sheath ; 

 x^ .r, fibrovascuTar bundles. 



Plate 369. Cephahutfhera Oregana Reichenb, (i) Transverse section of stele 

 of storage root : /, medulla ; x, x, xylem ; r, endodennis. (2) Transverse section of 

 stele of fibrous root : v, passage cells of eudodermis ; e, thickened cells of endodennis 

 outside of phloem ; s, phloem; %, xylem ; c, medulla. (3) Longitudinal section in 

 stele ; 0, s, vessels ; m, medulla ; //, endodermis, (4) Portion of transverse section of 

 rhizome : e, epidennis ; //, cortex ; /, sclercnchyma sheath ; g, fibrovascidar bundles 

 ^\Ith heavy sheath ; r, parenchyma. (5) Stoma from leaf. 



