312 
THE JOURNAL OF BOTANY 
Br. Is. up to G mm. long, G-9 
rows of cells in the border. S. Torreyanum Sull. 
Br. Is. up to 2 mm. long, 4-5 
rows of cells in the border. S.pulchrum Warnst. 
b. Chlor. cells of the br. Is. reaching the 
upper surface of the leaf. 
St. Is. obtuse ...;. S. amblyphyllum Buss. 
St. Is. acuminate. 
St. cortex in 1-2 well-defined 
layers ; spreading branches 
3 cm. long.-- . S.riparioides Warnst. 
St. cortex in 2—4 indistinct layers 
or apparently absent... S', recurvum P. de Beauv. 
B. Branch leaves widely ovate . S.molluscum Bruch. 
* 
Group Subsecundum. 
A. St. cortex distinctly 2 or more layered. 
St. Is. small, 07—1 mm. long x 05-08 
wide; triangular-lingulate, iibrillose 
only near the apex . S. contortum Schultz. 
St. Is. larger, 1-2 mm. long X 0*9-1 mm. 
wide ; lingulate, generally fibrillose to 
base .. S. platypJiyllum Warnst. 
B. St. cortex distinctly 1-layered except in 
S. franconia?, which is 1-2-layered. 
1. Br. Is. on both sides with few scattered 
pores or mixed with pseudopores. 
a. St. cortex distinctly 1-layered. 
# Br. l.s. with pseudopores mixed with 
true pores. 
Upper surface of st. 1. with few 
pores . S. camusii Warnst. 
Upper surface of st. 1. with many 
pores ____ S. armoricum Warnst. 
## Br. Is. without pseudopores. 
St. Is. ovate or oblong-ovate, U7— 
2*7 mm. long, .multifibrose ... S. obesum Warnst. 
St. Is. triangular-lingulate, 0’9- 
1-14 mm. long, efibrose, or 
fibrose in upper part only. S. Holtii Warnst. 
b. St. cortex 1-2-layered . S.franconice Warnst. 
II. Br. Is. with numerous true pores arranged 
in rows on one or on both surfaces. 
a. Br. Is. with numerous true pores on one 
surface only. 
# Br. Is. multiporose on the lower 
surface. 
t St. Is. minute, 0-5-1 mm. long. 
Br. Is. with pseudopores on upper 
surface. S. bavarian in Warnst. 
Br. Is. without pseudopores ... S. subsecundum Nees. 
