672 Marsh . — The Anatomy of some Xerophilous Species of 
‘ Cheilanthes gracillima , Eaton. Frond bi- or tripinnatifid, rachis 
slightly fibrillose, texture subcoriaceous ; upper surface naked, lower densely 
matted with pale brown woolly tomentum ; the margin of the segment 
much incurved. 
‘ Cheilanthes Fendleri , Hk. Frond tripinnatifid, rachis densely clothed 
above with lanceolate acuminate entire scales ; upper surface quite naked, 
Fig. r. Cheilanthes lanuginosa. Transverse section of leaf. 
Fig. 2. Diagram of transverse section of leat of Pellaea anaromedaefolia. 
under surface scaly only, not matted ; texture subcoriaceous, margin much 
incurved. 
‘ Pellaea andromedae folia , Fee. Texture subcoriaceous, rachis and both 
surfaces naked, involucre scarcely changed from the substance of the frond, 
and sometimes nearly meeting edge to edge.’ 
Leaf Anatomy. 
In addition to these characteristics, the minute anatomy of the leaf 
shows in each case a reduced lacunar system, the greater or less develop- 
