On lignification in the phloem of Helianthus annuus.

[1] CROSS, 1895, CELLULOSE OUTLINE, P94

[2] MOELLER, 1882, ANATOMIE BAUMRINDEN, P51

[3] MOLISHC, 1886, BERICHTE DTSCH BOT G, V4, P303

[4] SCHUMANN, 1890, BIETR Z ANAT COMPOSI, V41, P195

[5] 1896, U GENEVE LAB BOT, V6, P58

[6] 1875, ANN SCI NAT BOT, V2, P178

[1] CROSS, 1895, CELLULOSE OUTLINE, P94

[2] MOELLER, 1882, ANATOMIE BAUMRINDEN, P51

[3] MOLISHC, 1886, BERICHTE DTSCH BOT G, V4, P303

[4] SCHUMANN, 1890, BIETR Z ANAT COMPOSI, V41, P195

[5] 1896, U GENEVE LAB BOT, V6, P58

[6] 1875, ANN SCI NAT BOT, V2, P178