<34 
Ohio Biological Survey 
EXPLANATION OF PLATE III 
Fig. 1. A section through the thallus of Leptogiiim piilchellum, showing the plec- 
tenchymatous cortex above and below and the mycelial medulla within. 
The algal-host chains are shaded, x 435. 
Fig. 2. A similar section through the thallus of Leptogium tremelloides, highly 
magnified to show the close plectenchymatoid interweaving of the medullary 
hyphse. x 1,000. 
Fig. 3. A section showing a hypha and a portion of the thickened plectenchyma- 
tous cortex below an apothecium of Leptogium pulchellum. x 1,000. 
Fig. 4. Four cells of the upper plectenchymatous cortex of Leptogium chloromelum, 
isolated by maceration, but still cohering to the hyphse from which they 
were cut off. x 1,000. 
Fig. 5. A portion of a section of Leptogium pulchellum cut through the thickened 
plectenchymatous cortex below an apothecium, macerated, but the isolated 
cells still showing somewhat of the usual arrangement in vertical rows. 
X 1,000. 
Pig. 6. A section through the thallus of Syncchohlastus daccidus to show a plec¬ 
tenchymatous cortex over a limited area above and closely packed hyphae, 
forming a palisade over a limited area below. The horizontal lines above 
and below indicate the limits of the algal-host colony, x 875. 
Fig. 7. Another section of Syneclioblastus daceidus, showing roughly isodiametrical 
cells cut off at the dorsal and the ventral surfaces, but not plainly plecten¬ 
chymatous. X 875. 
P"ig. 8. xVnother section through the thallus of Syueehoblastus daceidus, taken from 
a region where there was little of the peculiar modification, but showing 
toward the center above two isodiametrical cells cohering in plectenclwma- 
like fashion, x 875. 
