CRYPTOMITRIUM 43 
lobed 9 receptacles, in the origin of the peduncle from a small 
latero-ventral innovation, which seems to occur rarely in С. 
androgyna, and in other characters of less moment. 
PLATE 92. GRIMALDIA CALIFORNICA. 
г. Plant, natural size. 
2. Thallus, with androecia and vegetative latero-ventral innovations, Х 3. 
3. Thallus, with androecia and peduncle-bearing innovation, Х 3 
4. Thallus, with peduncle-bearing innovations, Х 3. 
б.а thallhs, хол 
6. Transverse section of thallus, Х 12. 
7. Transverse section of thallus through androecium, Х 12. 
8. Transverse sections of mature peduncles, Х 20. 
9.-13. Outlines of ventral scales, mostly from near thalius apex, Х 20. 
14. Stoma and adjacent epidermal cells, Х 305. 
15-17. Ф receptacles (containing dehisced capsules), Х 4. 
18. Ventral view of receptacle with dehisced capsules, Х 8. 
19. Spores, Х 305. 
20. Elater, 305. 
All figures drawn from soaked out dried specimens ; 1-4, 6, 8, 9, 11, and 14-20, 
from portions of the original material collected by Dr. Bolander and preserved in herb. 
ted Gottsche and partly from U, S. National Her- 
Underwood (partly com by Dr. 
barium); 5, 7, 10, 12, and 13, from speci 
in the San Gabriel Mts. 
men collected by Professor A. J. McClatchie 
6. CRYPTOMITRIUM Aust. ; Underw. Bull. Ill. State Lab. Nat. 
Hist. 2: 36. 1884. 
Platycoaspis Lindb. Kongl. Sv. Vet. Akad. Handl. 23': 11. 
89. 
Thallus thin, green and often somewhat polished above, con- 
colorous or purple beneath, 6-15 mm. long, 1-3 times irregularly 
dichotomous, with the inner margins of the terminal segments now 
and then connate, sometimes progressing by apical or lateral in- 
novations from the rather thick costa, the segments obovate, ob- 
cordate, or oblong, 3-9 mm. in maximum width, venulose-areo- 
late, stomata simple, the minute pores surrounded by several 
finally oblong cells with unthickened radial walls ; scales small, 
violet-purple, irregularly biseriate, broadly ovate, variously lobed, 
extending half way to the margin or fragmentary and сее 
015; air-chamber layer of large empty cavities separated by mostly 
unistratose lamellae, these chambers in 3-5 layers over the costa 
in transverse section, occupying the whole of the very thin alar 
expansion and reduced to a single layer at the margin, the latter 
green or brownish-purple, undulate-repand or crenate, slightly as- 
