762 THE FRESH-WATER 
LOCHS OF SCOTLAND 
Polytrichum coinmune, 186, 256. 
gracile, 256. 
Pomphalyxophrys exigua, 326. 
Ponteporeia affi.nis, 307. 
Pontigulasia bigibbosa, 325. 
Porotrichmn alopecurum, 329. 
Porphyriclium crucntum, 191. 
Potamogeton, 231, 244, 255, 271, 381, 396. 
crispus, 180, 195, 244, 328. 
filiformis, 180, 195, 214, 250, 328, 
flabellatus, 180, 195, 255. 
friesii, 180, 195, 236. 
heterophyllus, 159, 180, 194, 216, 217, 
257. 
natans, 179, 194, 199, 203, 204, 207, 
209, 211, 214, 217, 222, 228, 249, 
250, 328, 357, 396. 
lucens, 180, 195, 199, 203, 204, 207, 
214, 228, 244, 249, 328, 385, 396. 
obtusifoUus, 180, 195, 243. 
obtusifolius, var. fiuitans, 254. 
ohtusifoliiis, yav. fluvialis, 180. 
pectinatus, 180, 195, 253. 
perfoliaMs, 180, 195, 214, 245, 259, 
328, 385, 396. 
polygonifolius, 179, 194, 203, 204, 207, 
211, 221, 222, 228, 231, 257, 328. 
polyr/onifolius, var. pseudo- fiuitans, 179, 
220. 
prmlongus, 180, 195, 204, 207, 328. 
pusillus, 180, 195, 207, 214, 250, 328. 
pusillus, var. tenuissimus, 180, 204, 
214. 
rufescens, 180, 194. 
rufescens, var. spathuUfolius, 180, 256. 
zizii, 180. 195; 249. 
Proales caudata, 322. 
daphnicola, 292, 300, 322. 
paras ita, 322. 
petromyzon, 322. 
sordida, 322. 
Protopterus, 364. 
Pseudodifflagia liorrida, 326. 
Pseudcecistes rotifer, 320. 
Pteris aquilina, 246. 
Pterodina cceca, 323. 
elliptiea, 323. 
patina, 323. 
reflexa, 323. 
truncata, 323. 
Pterogonium gracile, 188, 221, 329. 
Pterygophyllum lucens, 188. 
Quadrula symmetrica, 326. 
Radicula officinalis, 170, 214, 217. 
palustris, 170. 
pinnata, 170. 
Ranunculus aquatilis, 159, 168, 257. 
haudotii, 168, 250. 
circinatus, 168, 195, 245, 248, 250, 327. 
drouetii, 168. 
flammula, 169, 193, 203, 204, 208, 211, 
214, 217, 230, 234, 258, 327. 
flammula, var. naMns, 169, 220, 1^21, 
228. 
Ranunculus fiammula, var. pseudo-reptans, 
169, 251, 258. 
fiammula, var. reptans, 169, 251, 
259. 
hederaceus, 169, 210, 251, 327. 
heterophyllus, 169, 230. 
lenormandi, 169. 
lingua, 169, 193, 254. 
peltatus, 169, 194, 248, 250, 251. 
radicans, 230. 
sceleratus, 169. 
Raphidiopthrys, 278. 
conglobata, 278, 326. 
pallida, 278, 326. 
RapMdium, 332. 
Rattulus longiseta, 322. 
lophoessa, 322. 
scipio, 322. 
Rhacomitrium adculare, 186, 203, 231, 
329. 
canescens, 246. 
canescens, var. ericoides, 246. 
heterost ichi cm, 186. 
lanuginosum, 186. 
protensurii, 186. 
Rhizoclonium hieroglyphicum, 191. 
Rhizosolenia, 333. 
eriensis, 281. 
longiseta, 281. 
Rhyncliospora alba, 181. 
Riccia crystallina, 254. 
fiuitans, 357. 
Rivularia, 333. 
Rotifer citrinus, 321. 
longirostris, 321. 
macroceros, 321. 
neptunius, 321. 
socialis, 321. 
tardus, 321. 
trisecatus, 300, 321. 
vulgaris, S2l, 
Rubus chammmorus, 192. 
Rumex hydrolapathum, 175. 
Ruppia maritima, 328. 
Sacheria, 301, 329. 
Sagina nodosa^, 170. 
A^rt^za; aurita, 176, 243. 
repens, 246. 
Salmo fario, 318. 
Salpina mucronata, 323. 
mutica, 323. 
Salvinia, 357. 
Samolus valerandi, 175, 214. 
Sargassum, 357. 
Scapania, 200. 
undulata, 189, 191, 195, 198, 203, 204, 
208, 211, 226, 329. 
Scapholeberis mucronata, 316. 
Scaridium longicaudatum, 322. 
Scenedesmus, 358. 
antennatus, 332. 
obliquus, 332. 
Schoenus nigricans, 180, 242. 
Scirpus, 227, 381, 385, 391, 396. 
ccespitosus, 210, 219, 256. 
fiuitans, 181, 195. 
