Pammel — Anatomical Characters of Seeds of Leguminosae. 123 



with some additions, is added to show the relation which the 

 mucilage of the endosperm and the amyloid of the cotyledons 

 of Leguminosae bear to those of other plants. 



Classification of Pectocceltjloses. 



I. Cellulose mucilage. Colors blue with chlor-iodide of zinc and with sul- 

 phuric acid and iodine. Insoluble in cupra-ammonia. 



A. Secondary thickening of cell-walls. Epidermal cell-walls in seed 

 of Fyrus vulgaris, Brassica alba and other crucifers. 



B. Mucilaginous Intercellular cell-wall substance. Primary cell- 

 wall, Laminaria stipites. 



C. Cell contents, products of distinct mucilage cells. Orchid tubers. 

 II. True mucilages and gums. Color yellow with iodine, and blue with 



chlor-iodide of zinc. With hydrochloric acid produce oxalic and 

 mucic acids. 



A. Secondary thickenings of cell-walls. 



1. Epidermal cell-walls, Linum and Plantago. 



2. Subepidermal cells, buchu leaves. 



3. Mucilaginous endosperms. 



a. Leguminosae: Gymnocladiis, Gleditschia, Ceratonia, Les- 

 pedeza, Cassia Fistula, C. marylandica, Astragalus^ Tet- 

 ragonolobus, Trifolium, Medicago, Bohinia, etc. 



b. Liliaceae: Polygonatum. 



4. Mucilage of single cells or groups of cells in other tissue. 



Althaea, Cinnamon bark, Frangula bark, flowers of Tiliat 

 flowers of Malvaceae, seed of Cocoa, Loranthus, Viscum. 



B. Outer part of the cell-wall. 



1. Filaments of algae, Spirogyra. Hyphae of many fuugi. 



2. The gummy resinous product of ** colleters," especially 



young bud scales of Aesculus, in which the collagen layer 

 under the cuticle becomes mucilaginous. Also some other 

 epidermal glands. Multicellular glands in which the mu- 

 cilage occurs in the separating walls of cells : Stems of 

 Silene. 



C. Mucilaginous intercellular cell-wall substance. Primary cell- 

 wall. 



1. Carragheen and other Algae. 



2. The intercellular cell-wall substance of the mucilaginous 



endosperms, Tilia and Mallow flowers. These may in 

 some cases later become mucilaginous. 



D. Cell contents from distinct mucilage cells. Gum cells in the 

 axial Inflorescence of Hagenia Abyssinica. 



E. The contents of entire tissues. 



1. Khizome of Symphytum, Agropyron repena. 



2. Succulents, Aloe. 



3. Bulbs, Allium, Scilla. 



4. Algae. 



6. Protective gums, Acajou, and Simaniha, 



