516 
Peltigera malacea, structure 
ofthallus, 406. 
—, structure of thallus, 404, 
406. 
Penicillium, 193, 198, 199, 
226, 232, 234, 239, 245, 
251, 254. 
—, abscision of gonidia, 66, 
70*, 
— aureum, 206. 
—, capacity of germination, 
348. 
—, conditions of germination, 
350. 
—, conditions of vegetation, 
353, 354- 
—, discharge of spores, 81, 
97. 
—, effect on substratum, 
358. 
—, fatty matters, 7. 
—, formation of spores, 62. 
—, germination, 111, 
— glaucum, 204, 226. 
— —, abscision of gonidia, 
70*, 
— —, capacity of germina- 
tion, 344. 
— —, cell-nucleus, 6. 
— —, conditions of germina- 
tion, 349. 
— —, mycelial membranes, 
21. 

‚ parasitism, 370, 380. 
— —, resistance of spores, 
347. 
—, gonidiophores, 48. 
—, sclerotioid compound 
sporophores, 43. 
—, secretion of ferment, 
355. 
—, simple sporophores, 46. 
—, thallus, 1. 
Perichaena, 435. 
— liceoides, 423, 427, 428, 
435, 441, 448. 
Periconia, 252. 
—, formation of spores, 66. 
Peridermium elatinum, 277, 
282. 
— —, parasitism, 368, 388, 
390. 
— Pini, parasitism, 388. 
— —, structure of spores, 
100, 
Peridiola, 311, 320. 
Peridium, 48, 193, 
308. 
—, inner, 311. 
—, outer, 311. 
Periphyses, 192, 
Periplasm, 133. 
Perithecia, 76, 187, 190, 239, 
401. 
275) 
INDEX, 
Peronospora, 138, 232. 
—, abscision of spores, 72. 
— Alsinearum, fertilisation, 
133% 
— arborescens, fertilisation, 
133*. 
— Arenariae, parasitism,391. 
— calotheca, haustoria, 20*. 
— densa, germination, 112. 
— —, haustoria, 20. 
— —, parasitism, 393. 
—, development, 134. 
—, discharge of spores, 82. 
—, membrane, 12. 
— nivea, haustoria, 20. 
— —, parasitism, 363, 393. 
— parasitica, haustoria, 20. 
— —, parasitism, 359, 362. 
—, parasitism, 358, 386, 391. 
— pygmaea, germination, 
112. 
— —, haustoria, 20. 
— —, parasitism, 364. 
— Radii, parasitism, 
364, 390, 391. 
—, simple sporophores, 46, 
47. 
—, thallus, 1. 
— Umbelliferarum, parasi- 
tism, 363, 389. 
— Valerianellae, 135. 
— violacea, parasitism, 368, 
390, 391. 
— viticola, parasitism, 393. 
Peronosporeae (Peronospo- 
rei), 132, 183, 232, 233, 
236. 
—, absence of calcium, 11. 
—, capacity of germination, 
343, 344, 349. 
—, cell-nucleus, 6. 
—, cellulose-membrane, 8, 
—, conditions of germina- 
tion, 350, 
— discharge of spores, 82. 
—, formation of spores, 74, 
75+ 
—, germination, 113. 
—, haustoria, 20*. 
—, mycelium, 20*. 
—, parasitism, 359, 362, 386, 
358, 
393. 
—, pleuroblastic, 20. 
—, resistance of spores, 345. 
—, resting state of spores, 
344. 
—, swarm-spores, 109. 
—, thallus, 1. 
Pertusaria communis, ger- 
mination, ı14*. 
— de Baryana, germination, 
112*, 
— fallax, calcium oxalate, 
409. 
Pertusaria lejoplaca,develop- 
ment of spores, 78. 
— —, germination, 114*. 
—, number of spores, 79. 
—, soredia, 415. 
—, structure of thallus, 405. 
Peziza (see also Sclerotinia), 
189. 
— abietina, 86. 
— —, ejection of spores, 86. 
—-—, structure of spores, 
106. 
— Acetabulum, develop- 
ment of spores, 106. 
— —, ejection of spores, 85. 
— —, puffing of spores, 89, 
92. 
— —, structure of spores, 77. 
— aeruginosa, colouring mat- 
ter, 8. 
— Aglaospora, 243. 
— arduennensis, 243. 
— aurantia, fatty matters, 
7. 
— —, structure of spores, 
100, 
— baccarum, sclerotium, 30, 
41. 
— benesuada, doubtful sper- 
matia, 243*. 
— bolaris, 243. 
— —, germination, 115. 
— calycina, development of 
spores, 78. 
— Candolleana, sclerotium, 
30, 31, 32. 
— ciborioides, 
39, 41. 
— confluens, 208. 
— —,developmentofspores, 
76, 77*. 
— —, ejection of spores, 86, 
— convexula, ejection of 
spores, 85, 86. 
— —, structure of spores, 
102, 
— cupularis, ejection of 
spores, 85, 86. 
— Curreyana, desertion of 
host, 388. 
— —, sclerotia, 33, 37, 41. 
— Cylichnium, 243. 
— —, germination, 115. 
—, development of asco- 
spores, 76. 
— Duriaei, sclerotia, 37. 
— Durieuana, 243. 
— —, desertion of host, 388. 
— —, sclerotia, 41. 
—, ejection of spores, 89. 
— Fuckeliana, 245, 254. 
— —, abscision of spores, 
63, 72. 
— —, cell-nucleus, 6. 
sclerotium, 
