204 THE JOURNAL OF BOTANY 
Wroxham. — C. jiliformis L. Great Fen; Barton; Ranworth; 
Wood Marsh, Stalham. — C. rostrata Stokes. Wood Marsh, Stal- 
—C. curtaGood. Marsh below Blackfleet Broad. Now known 
in four stations in the county. 
Spartina stricta Roth. Near Lynn; F. J. A. Hort in Bot. 
Gaz. ii. 54 (1850). 
Lastrea Thelypteris Presl. Great Fen ; Barton.—Osmunda regalis 
L. Wood Marsh, Stalham; sparingly for some mile or so between 
Heigham Sounds and Waxham. 
Ophioglossum vulgutum L. Blackfleet Broad; Great Fen; Bar- 
ton ; Wood Marsh, Stalham. 
Chara _polyacantha Braun. Blackfleet Broad, in great beds 
many yards across, and so dense in places as to prevent a boat from 
INFECTION-POWERS or ASCOSPORES mx ERYSIPHACEZ. 
By Eryesr §, Sazmon, F.L.S. 
(Concluded from p. 165.) 
In Exper. no, 10 ascospores were sown, on April 16th, on 
Hordeum vulgare (6 plants, twelve days old), and on H. maritimum 
(8 plants, twenty days old). The inoculated plants of H. vulgare 
were in two pots. In one pot the control leaves were well separated 
from the inoculated ones, and the plants were kept covered under 
a glass beaker for the first eight days of the experiment. On April 
mycelium with vigorous tufts of young conidiophores ; the control 
plants (twelve in number) were all free. On April 22nd 
leaves agains other in their rapid growth under the 
glass beaker. Further, on April 19th, the glass booker over this 
