﻿24 Howe: The Anthocerotaceae 



12. Median longitudinal section of the thallus, X 53- 

 13-15. Involucres, X I2 « 



16. Pseudo-elaters, X 22 5- 



17. Spores, X SOS- 

 All figures of A. Pearsoni from Californian material ; I, 13, 16 and 17, Mill Val- 

 ley, Marin Co. (the type); 2-4, near Duncan's Mills, Sonoma Co. (no. 1200) 

 5, 9, 10, 14 and 15, near Mendocino (no. 702) ; 6 and 7, Cazadero, Sonoma Co. (no. 

 1 199) ; 8, Palo Alto (Prof. D. H. Campbell) ; 1 1 and 12, Mill Valley, Feb. 22, 1896. 



Plates 324 and 325. Anthoeeros phymatodes M. A. Howe. 



1. Portion of the thallus, natural size. 



2. Ventral view of a thallus segment, showing costa and tuber, X 2 3- 



3-6. Lateral views of thallus segments, showing form and stages of development 



of tubers, X 2 3- 



7 and 8. Old tubers, showing vegetative propagation by sprouting, X 2 3- 



9. Longitudinal section through costa and young tuber, X 47- 



10. Longitudinal section showing early stages in the formation of the tuber* 

 X 47. The section is somewhat oblique and does not exhibit the full thickness of the 



costa. 



11. Section through a well-grown tuber, X 53- 



12. A single interior cell from fig. 1 1, X 3°5* 



13. Longitudinal section through the costa, X 53* 



14 and 15. Transverse sections of thallus segments, X 53« 



1 6. Outlines of two other transverse sections of thallus segments, X 2 3* 



17. Involucres, X I2 - 



Figs. 1-6 and 9-17 from specimen collected in Mill Valley, Marin Co , California. 



February 22, 1896— mostly drawn from material fixed with \% chromic acid and pre- 

 served in alcohol; 7 and 8, from same locality, March 19, 1892. 



18. Involucre of Anthoceros polymorphous Raddi, y die hot omits Raddi, ex herb. 

 Raddi, X I2 - 



Plate 326. Anthoeeros Maeounii M. A. Howe. 



1. Portion of thallus with involucres and sporogonia, X I2 * 



2. Capsules after dehiscence, X I2 - 



3. Involucres, X I2 « The capsules of A. Maeounii appear to be very brittle ; 



in this fragment they weie found broken off at the mouth of the involucres as indicated 

 in the figure. 



4. Involucre and capsule with a broken valve, X 12 * 



5. and 6. Involucres and broken capsules, X I2 « 



7. Stoma from surface of capsule, X 3°5- 



8. Columella, X 53* 



9. Spores and pseudo-elaters, X 3°S* 

 All the above figures from Can. Hep 81. 



10. Spores of Anthoeeros punctatus L. from Hep. Bor-Am. 122, X 3°5- Intro- 

 duced for comparison. 



Department of Botany, Columbia University, 



lanunry 7, 1898. 



