SPHAEROCARPUS 67 
the face ; sterile cells cubico-spherical to oblong-cylindrical, 45-70 
и in longest diameter, obscure at maturity of the spores. 
Exsicc. Hep. Аш. 160 (as Sphaerocarpus terrestris Mich., var. 
Californicus Aust., a little of which is intermingled in the three sets 
examined). 
California: near Stanford University,* May, 1892 (Professor 
D. H. Campbell); Berkeley, Feb. 15, 1896 (Howe). na 7) 
Sphaerocarpus cristatus is а very remarkable species with no 
near relatives, so far as can be ascertained from accessible Шега- 
ture and specimens. The spores separate very early—at a time 
when they are still colorless and only 40-50 и in diameter and 
when the surface markings have become scarcely visible. This 
early dissolution of the tetrad is a character of almost generic 
importance yet the gap in this respect between Sphacrocarpus cris- 
tatus on the one hand and Sphaerocarpus Californicus Aust. and 
Sphaerocarpus Sphaerocarpus (Dicks.) on the other, in which, so 
far as we have observed, the spores are permanently united in 478, 
is bridged over somewhat Бу S. Donnellii Aust., from Florida, іп 
which the spores separate at maturity. But the spores of 5. Don- 
пей are quite different in their more angular outline and in their 
markings, being areolate instead of typically cristate and being also 
prominently tuberculate-papillate in the basilar circumference. 
Professor Campbell (Erythea 4: 73-77. 1896) was the first 
to observe and record the separation of the spores in Californian 
specimens of Sphaerocarpus and it seems probable from his de- 
scription and drawings that his interesting “ Notes on Sphaero- 
carpus” (2. c.) were based, chiefly at least, upon S. cristatus. 
Hep. Am. 160 in the herbarium of Professor Underwood we 
would name as the type of the species. 
PLATE 100. 
Figs. 1-8, Sphaerocarpus cristatus. Ў 
All figures are drawn from the type material. 
I. 9 plant, with matured involucres and sporogonia, natural size. 
2. Portion of thallus with involucres of various ages, X 23 
3. Sporogonium, Х 23. | 
. Am. 160 is “ San Mateo Co.," but Professor Camp- 
isely defined station that nearly all his 
f Santa Clara County, in which Stan- 
* The locality given in Hep 
bell writes in reply tó a request for a more prec 
Hepaticae have been collected within the limits 0 
ford University is situated. 
