294 
x 
Loma 
CPWAKRY DH 
Fic. 1. 
sporangia. 
1G. 2. 
annuli. 
Fic. 3. 
sori, X 10. 
Fic. 4. 
Fic. 5. 
xX 10. 
Fic. 6. 
below, X 1 
Berry: A NEW MATONIDIUM FROM COLORADO 
Explanation of plates 12 and 13 
PLATE 12 
MATONIDIUM AMERICANUM Berry 
Under side of fertile pinna showing stout furrowed rachis. 
Under side of fertile pinna showing normal size and form. 
Upper side of apical ghia of pinna. 
Portion of same, 
Basal part of pinna a below. 
Upper part of pinna from above. 
Maximum size of rare occurrence, from above. 
Fragment from below showing maximum development of sori. 
Apex of stipe showing indications of 39 pinnae. 
Apex of stipe with 25 pinnae 
Apex of stipe of another specimen. 
Counterpart of apex of specimen shown in 11 with indications of 36 
PLATE 13 
Fics. 1,2. MATONIA PECTINATA R. Br. 
Lamina and sorus in vertical section showing indusium (black) and. 
Sorus in transverse section showing central pillar and sporangia with 
Fics. 3-6. MAaTONIDIUM AMERICANUM Berry 
Two pinnules of normal form from below to show form and position of 
Same in longitudinal vertical section, x 10. 
A ative ‘ le int ti showi 

J t—2 
Two pinnules of the large form with maximum number of sori, from 
