976 
INDEX. 
Pro-nucleus, 495. 
Prosenchyma, 83, 950. 
Protandrous, 910. 
Proteaceae, 662. 
Proteids, 51. 
P roten, 121. 
Protenchyma, 121. 
Prothallium, 225, 385, 393, 
394> 427, 444j 447, 47i, 
486, 498, 521, 522, 582. 
Protococcus, 248, 329. 
Protogynous, 910. 
Protomyces, 335, 957. 
Protonema, 226, 342, 346, 
361, 362, 363, 376 (Figs. 
247, 284, 250, 259). 
Protophyta, 244, 245. 
Protoplasm, 2, 37, 947. 
Prototaxites, 272. 
Pseudaxis, 178, 180. 
Pseudocarp, 221, 594, 614. 
Pseudo-parenchyma, 84,307. 
Pseudopodium — 
of Mosses, 369. 
of Sphagnum, 379 (Fig. 
263). 
Pseudotsuga, 533. 
Psiloteae, 392. 
Psilotum, 164, 460, 464, 942, 
957. 
Psoralea, 81 (Fig. 69). 
Pteris, 24, 27, 28, 30, 35, 109, 
113, 123, 144, 216, 424, 
426, 428, 429, 431, 439 
(Figs. 22, 27, 28, 31, 38, 
84, 91, 95, loi, 112, 156, 
294, 296, 299-301, 307, 
308). 
Puccmia, 331, 333, 334 (Figs. 
223, 224). 
Pulvinus, 880, 882, 889. 
Punctum vegetationis, 138. 
Punica, 651. 
Purpose, 934. 
Puschkinia, 495. 
Putamen, 616. 
Pycnidium, 308, 316, 326. 
Pycnophycus, 282. 
Pyrenomycetes, 316. 
Pyrola, 562, 634 (Fig. 387). 
Pyrolacese, 659. 
Pyrus, 559. 
Pythium, 273. 
Pyxidium, 616. 
Quercus, 593? 636 (Figs. 438, 
439)- 
Raceme, 595. 
Racemose branching, 179. 
Racemose inflorescence, 595. 
Racoblenna, 328. 
Radial bundles, 949. 
Radiation of heat, 725. 
Radicle, 593, 635. 
Radula, 343, 346, 356, 362 
(Fig. 245). 
Rafliesiacese, 634, 656. 
Ramalina, 327. 
Ramenta, 428, 435. 
Ramondieae, 658. 
Ranunculaceae, 634, 657. 
Raphe, 492, 570. 
Raphides, 65, 84, 88. 
Reaumuriacese, 660. 
Receptacle — 
of Flower, 221,490, 559, 
614 (Figs. 159-161). 
of Mosses, 370 (Figs. 
253, 256). 
Receptacles for secretions, 
93- 
Receptive spot, 271,280, 425. 
Reciprocal hybrids, 916. 
Regular flowers, 611. 
Rejuvenescence of the cell, 
8, 945. 
Reproductive cells, 223, 896, 
Reseda, 608 (Fig. 145). 
Resedaceae, 608, 659. 
Reserve-materials, 704. 
Reservoir of reserve-mate- 
rials, 704. 
Resin, 705. 
Resin-passages, 93, 94, 532, 
949 (I^^ig- 78). 
Respiration, 721. 
Restiaceae, 632. 
Resupination, 604. 
Retardation of growth by 
light, 755, 832. 
Revolving nutation, 855. 
Rhamnaceae, 660. 
Rheum, 565 (Fig. 391). 
Rhinanthus, 579, 648. 
Rhizantheae, 656. 
Rhizine, 319 (Fig. 214). 
Rhizocarpeae, 385, 391, 442, 
957. 
Rhizocarpon, 323. 
Rhizoclonium, 281. 
Rhizoid, 231, 293, 296, 367 
(Figs. 80, 191, 248). 
Rhizome, 216. 
Rhizophore, 168, 477. 
Rhododendron, 557. 
Rhodoraceae, 601, 659. 
Rhodospermine, 50, 51, 298. 
Rhus, 644 (Fig. 452). 
Rhynchonema, 904, 920. 
Ribes, 107 (Fig. 90). 
Riccia, 344, 351, 354 (Figs. 
239, 240). 
Riccieae, 352, 354. 
Ricinus, 53, 112, 114, 182, 
544, 635, 705, 716 (Figs. 
48, 93, 94, 139, 366, 435, 
471). 
Rivularia, 248. 
Rivularieae, 247, 328. 
Robinia, 584, 652. 
Roccella, 329. 
Roestella, 331, 335. 
Root, 1 50, 162. 
Root-cap, 144, 162, 952 
(Figs. 112, 114, 120-122). 
Root-hairs, 162. 
Root-pressure, 676, 685, 
688 (Figs. 467, 469). 
Root-sheath, 165 (Figs. 123, 
124). 
Root-system, 164. 
Roots — 
branching of, 164, 181 
(Figs. 125, 138). 
fibrovascular system of, 
114, 949 (Figs. 96, 
106). 
growth in thickness of, 
133 (Figs. 106, 107). 
Rosa, 220 (Fig. 160). 
Rosaceae, 662. 
Rose-hip, 221, 614. 
Rosette, 521. 
Rosiflorae, 662. 
Rostellum, 913 (Fig. 492). 
Rotation of protoplasm, 39, 
43- 
Rubiaceae, 643, 658 (Fig. 
446). 
Rubus, 578. 
Rudbeckia, 599. 
Ruscus, 217, 935. 
Rutaceae, 660. 
Ruteae, 660. 
Sabal, 191 (Fig. 149). 
Sabina, 516, 527. 
Sabulina, 578. 
Saccharomyces, 244, 249. 
Saccharomycetes, 244, 249, 
955. 
Sagittaria, 74, 624 (Fig. 59). 
Salicineae, 660. 
Salisburia, 512, 527 (Fig. 
347). 
Salix, 599. 
Salvia, 912, 940 (Fig. 498). 
Salvinia, 191, 391, 443, 444, 
445, 449, 450, 453 (Figs. 
150, 309, 311-313, 316, 
319). 
Salviniaceae, 391, 459- 
Samara, 615. 
Sambucus, 650 (Fig. 465). 
Samolus, 566, 599. 
Samydaceae, 659. 
Sanguisorba, 578. 
Sanguisorbeae, 662. 
Sasitalaceae, 576, 662. 
Santalum, 579, 580, 581. 
Sap- vesicles, 42. 
