THALLOGENS. 1 3 FUNGALS. 
Puccrnta. Persoon. 
Microscopic. Pear-shaped or oblong bodies, containing spores, having internal 
partitions, and furnished with a slender stalk, by which they are 
attached to an internal mycelium. 
1. P. graminis Persoon.—(Corn Mitpew.) Fig. 20. 
Pitch brown or black, growing in irregular lines, which become occasionally 
confluent. 
Habitat. Leaves and straw of Grasses, 
Quality. Preys upon the juices of plants, especially of Corn, and prevents the grain 
from swelling. 
AXciprum. Persoon. 
Microscopic. Cellular membranous sacs, bursting at the side or apex, and 
discharging numerous spores. 
1. Ae. cancellatum Persoon. 
Forms spots, which are yellow at first, and then become red and prominent, 
in figure somewhat conical, splitting at the side in an irregular manner ; 
spores brown. 
Habitat. The leaves of Pear trees. 
Quality. A destructive parasite, greatly injuring the trees which it attacks. 
2. Me. Berberidis Persoon.—(Berperry Buieut.) Fig. 22. 
Forms roundish bright red spots, in figure elongated, bursting irregularly 
at the end, and becoming cups; spores orange. 
Habitat, Leaves of the common Berberry. 
Quality. A troublesome parasite, erroneously supposed to blight Wheat. 
3. Ac. Urtice De Candolle.—(Nettie BuieHt.) ; 
Spore-cases form oblong orange heaps on the under side of the leaves, each _ 
being nearly round, and finally gaping wide. ; 
Habitat. Common on Nettles. ‘ 
Quality. Like other parasites, deprives the plant on which it grows of the organisable 
matter intended for its own nutrition. 
ErysipHe. Hedwig. = 
Microscopic. A fleshy, somewhat gelatinous mass, opening at the collapsing | oo 
apex, and standing in the centre of a free 
floccose superficial mycelium. 
1. E. communis Schlechtendahl. 
‘Mycelium dirty white, resembling cobweb, at length 
forming spots ; rays simple, acute. 
Habitat. On the living leaves of herbaceous plants. een cl 
ity. A surface parasite, infesting various plants, especially  “(¢@K/Jk 
the Pea, which it overruns and destroys, : r 
_ 2. Ei. bicornis Link. Fig. 24. : ce 
-Mycelium-milk-white, densely entangled into a white skin; rays very 
short, forked, and warted at the point. ees 
Habitat. Very common on Maple leaves, rendering them hoary. 
Quality. As in the last. ; 
