BOTRYTIS. 



BOTPtYTIS. 



B. (Polyactis) cana, Schmidt. Fertile 

 filaments cinereous or whitish, branched at 

 the apex ; spores large, oval. On rotting 

 stems and leaves. Mucor racemosus, Bul- 

 liard, t. 504. fig. 7. 



B. (Polyactis) vulgaris, Fr. (fig. 263). 

 Fertile filaments grey, divided at the apex 

 into lobe-like branches, on which are col- 

 lected the globose minute spores. Common 

 on rotting plants. B. acinorum, Pers. Fre- 

 senius, Beitr. z. Myc. i. pi. 2 (?). Polyactis 

 vulyaris, Nees, Syst. fig. 57. 



B. vera, Fr. Fertile filaments grey, 

 branched above, forming spikes about the 

 slender apices. On decaying substances, 

 fungi, &c. Mucor Botrytis, Bolton, pi. 132. 

 fig. 3. 



B. crustosa, Fr. Fertile filaments white, 

 simple, trifid and verticillate ; spores glo- 

 bose, terminal. On stems and leaves. 



B. citrina, Berk. Mycelium white ; fer- 

 tile filaments erect, articulated, branched ; 

 branches subcymose, and, like the obovate 

 spores, lemon-coloured. On dead branches 

 of cherry-trees. Berkeley, Ann. N. H. i. 

 p. 262, pi. 8. fig. 12. 



B. terrestris, Pers. Fertile filaments 

 white, quaternately divided at the tips, each 

 tip bearing a single globose spore. On rot- 

 ten sticks. Berk. I. c. pi. 14. fig. 24; Sta- 

 cliylidium terrestre, Grev. Sc. Crypt. Fl. 

 pi. 257. 



B. Jonesii, Berk, and Br. Fertile fila- 

 ments erect, fawn-coloured, branched above ; 

 branches and branchlets divergent, mostly 

 opposite, the last fasciculated, the centre 

 always sterile and very acute ; spores round- 

 ish, spinv. On dung. Ann. N. H. 2 ser. 

 xiii. pi. 15. fig. 12. 



B. Tilletii, Desm. Fertile filaments 

 branched, fulvous; branchlets very short, 

 whorled ; spores subglobose. On mosses 

 and various leaves. Desmaz. Crypt. Exs. 

 fasc. v. No. 226; Ann. d. Sc. Nat. 2 ser. x. 

 308. 



B. (Peronospora) urticce, Libert, MSS. 

 (Berk.). Fertile filaments greyish lilac, 

 loosely divided above ; branches forming 

 an acute angle ; extreme branchlets simple 

 or forked, sometimes curved, rarely inflated ; 

 spores large, ovate, apex papilliform. On 

 nettle-leaves. Berk. Ann. N. H. ser. 2, vii. 

 p. 100. 



B. {Peronospora) parasitica, Pers. Fer- 

 tile filaments white ; Branches ramulose ; 

 spores very large, globose. Caspary has 

 found here cysts containing minute spores 

 (sporidangid). On Ouciferae (turnips, cab- 



s, &c.). Berkeley, J. Hort. Soc. i. pi. 4 

 fig. 26; Corda, Ic. Fung. v. pi. 2. fig. 18 

 Mucor Botrytis, Sowerby, pi. 359. 



B. (Peronospora) effusa, Greville. Fertile 

 filaments purplish-grey, branched above ; 

 branches short, divaricate; spores large, 

 oval. Frequent on the lower face of leaves 

 of spinach. 



B. (Peronospora} curta, Berk. Fertile 

 filaments simple, abbreviated, denticulate 

 at the tips, grey-brown; spores oval. On 

 Anemone nemorosa. Berk. Ann. Nat. Hist. 

 I. c. pi. 8. fig. 13. 



B. (Peronospora) destructor. Fertile fila- 

 ments grey, erect, scarcely septate ; branches 

 alternate, the last forked, hooked, and diva- 

 ricated; spores obovate, much attenuated 

 at the base. Very destructive on species of 

 Allium (onions &c.). Berk. Ann. Nat. Hist. 

 vi. p. 436, pi. 13. fig. 23. 



B. (Peronospora) Arenarice, Berk. 

 White; fertile filaments dichotomous 

 above, divaricate-forked, not hooked at the 

 tips ; spores ovate. On the leaves of Are- 

 naria trinervis. Berk. J. Hort. Soc. i. p. 31. 

 pi. 4. fig. 22. 



B. (Peronospora) Vicice, Berk. White ; 

 fertile filaments sparingly branched, elon- 

 gate ; branchlets bifid , not hooked ; spores 

 obovate, apiculate. On common Vetches 

 (a distinct species, purple, is said to grow 

 on peas). Berk. /. c. pi. 4. fig. 23. 



B. (Peronospora) arborescens, Berk. 

 White ; fertile filaments very much branched 

 above, di-trichotomous, somewhat forcipate 

 at the apex; spores smallish, subglobose. 

 On common red-poppy leaves. Berk. I. c. 

 pi. 4. fig. 24. 



B. (Peronospora) ganglioniformis, Berk. 

 White, in patches ; fertile filaments branched 

 above ; branchlets curved, dilated in gang- 

 lioid thickenings below the tips ; spores 

 small, subglobose. On lettuces. Berk. I. c. 

 pi. 4. fig. 25. B. geminata, Unger, Bot. 

 Zeit. v. pi. 6. fig. 9. Bremia lactucce. Regel. 

 Bot. Zeit. 1843, i. p. 665, pi. 3 B. 



B. (Peronospora) macrospora, Ung. Fer- 

 tile filaments erect, several from the same 

 point, white, branched above ; spores very 

 large, elongate-pyriform. On leaves of pars- 

 nips and other Umbelliferae. Unger, Exan- 

 tlieme, pi. 2. fig. 14 B. 



B. (Peronospora) infestans^ Montagne 

 (PI. 26. figs. 5, 6). the Potato-fungus. 

 This grows in tufts on the lower surface of 

 the leaves, and also on the tubers of the 

 potato, forming white mealy spots. The 

 mycelium ramifies in the intercellular pas- 



