DKSCRTPTTON OF PLATES. 59 



fungus grown in a pure culturt'. Fig 7. — Asci from tho same; a, cylindrical 

 form, witli ovorlaiii)ing uuiseriate spores: /*. shorter suljclavate form; c. 

 ascus from older culture, slunving sliorter stipe. Fig. 8.— Fresh, mature 

 ascospores from the same. Fig. 9.— Asci and fugaceous parapliyses from 

 culture of GlomercUu rufotuacidans racriiiii. Fig. 1(». — I'ortion of an 

 acervulus of (llocosinnluui uihnix. from a pure culture from a diseased New- 

 Jersey hi'rry. Fig. 11. — Conidia from the same. Fig. 12. — A porti«)n of a 

 cranlierry leaf, showing the slightly elevated epidermis and the protruding 

 neck of Acaiithorhinichus luccinii. Fig. i:^.— A single perithecium of the 

 same fungus, taken from a pure culture on corn meal, showing portions of 

 the hyi)ha' which form the thin, loose mycelial layer with which the perithecia 

 are overgrown in artificial cultures. Fig. 14.— Asci and parapliyses from 

 the same pure culture; a. a young ascus. in which the mature ascospores 

 are surrounded hy granular gelatinous matter; h. a slightly older stage; c, 

 a nearly mature ascus. in which tlie granular protoplasm is shrunken about 

 the spores and attached to the apex of the ascus. A jiortion of it remains 

 as a thin gelatinous envelope about the spores after they are expclUvl from 

 the ascus. Fig. lo. — Two ascospores of the same. Fig. 1<». — A germinating 

 ascospore. bearing the peculiar appressorium. Fig. 17. — An appressorium 

 viewed from :U)ove. Fig. 18. — A grouj) of appressoria attached to the sur- 

 face of a cranberry leaf. Fig. 19. — A germinating appressorium grown in a 

 poured itlate. Fig. 20. — A germinating appressoriinn from the midrii) of a 

 leaf, showing superficial branching hypha\ Fig. 21. — A section of a germi- 

 nating appressorium on a leaf; a, a germ tube which has entered the leaf 

 tln-ough a stom.-i. Fig. 22. — Another germinating appressorium ; (i. the germ 

 tube entering tlie leaf through a stoma. 

 Plate IV. — Fig. 1. — Vcuttirhi coiiuHicta. Massachusetts specimens on the under 

 surface of a leaf showing various aggregations of i)erithecia. (Natural 

 size.) Fig. 2. — (Jronp of perithecia magnified 24 diameters. Fig. o. — Single 

 perithecium, showing sjiines distributed over the upiK'r half. Fig. 4. — Two 

 asci, showing varialdlity in shape and length. Fig. 5. — A perithecium of 

 the same fungus from a Wisconsin specimen, showing fewer spines ar- 

 ranged about the apex. Fig. C. — ^Three asci from the same, showing varia- 

 tions in shape and arrangement of the si)ores. Fig. 7. — A single ascospore 

 from the same. Fig. 8. — A perithecium of Anthostomella destruens from a 

 pure culture of the fungus. Fig. 9. — An ascus from the same. Fig. 10. — 

 Two ascospores of the same. Fig. 11. — A germinating ascospore of Antho- 

 stomeUa <lcstnieiis. Fig. 12. — Pycnidia of f^eptoria Jonf/ispora on under sui'- 

 fa'ce of a cranberry leaf. Fig. 18. — Section of a ])ycnidium of Heptoria 

 longispora on a cranberry leaf. Fig. 14. — Three spores of ^eptoria lonrji- 

 spora from a cranberry leaf. Fig. 15. — Sijnchytrium vaccinii on pedicel, 

 bracts, and flower of a cranberry. (Natural size.) Fig. 16.— Syiwhyti'iiim 

 vaccinii. A single gall enlarged. Fig. 17. — Synchytrium vaccinii. A sec- 

 tion through a gall showing the hypertrophied tissue and the sporocarp. 

 Fig. 18. — Arachniotiis tiachyspermus on a decayed and shriveled cranberry. 

 Fig. 19. — Arachniotus trachyspenuus on the side of a culture flask. Fig. 

 20. — Aseogenous hyphfe and asci of the same from a pure culture. Fig. 21. — 

 A single ascus of the same from a pure culture. Fig. 22. — A single asco- 

 spore of the same. Fig. 23. — Sclerotinia oxycocci Wor? Branching chain 

 of conidia, inverted ; a, a single conidium. Fig. 24. — Cladosporinm oxy- 

 cocci. Conidiophores bearing conidia from a cranberry leaf; a, a single 

 septate conidium from the same. 



110 



