28 RICCIACEAE 
The specimen collected by Professor Campbell near Stanford 
University on May 1, 1896, we consider the type of the species. 
This specimen, so far as we have noticed, does not contain the oil- 
bodies referred to in the description, but such occur sparingly in 
the previously collected specimen now preserved in the Underwood 
Herbarium and are very abundant in alcoholic material from the 
same locality communicated by Professor Campbell. These are 
present also in the San Francisco plant, but are sparingly developed 
or absent in the specimens from Fort Ross and Ukiah. Allusion 
is made in our remarks under A. жуа Йа to the occasional be- 
havior of the contents of the epidermal cells when treated with 
iron-haematoxylin. 
PLATE 91, Fics. 1-15. RICCIA CAMPBELLIANA. 
1. Plant, dry, natural size. 
2 and 3. Plants from soaked-out dried material, natural size. 
„жто. 
5-8. Outlines of-transverse.sections of thallus-segments, 12. 
9. Outline of transverse section of an unusually wipg-margined thallus-segment, 
23. 
IO. Papilliform elevation of antheridial ostiole, Х 53. 
II and I2. Thin transverse sections showing epidermis and cells containing “ oil- 
bodies," 5 3, the latter section from an older part of the thallus. 
13. Cell from older part of thallus containing **oil-body " which here appears 
densely granular (yellowish-brown in the alcoholic material), 225. The adjacent 
cells contain chloroplasts and starch-grains. 
I4 and 15. Spores, Х 305. 
Fig. 1 drawn from specimen collected at Fort Ross, March 15, 1896; 2, 9, 14, and 
I5, near Stanford University ( Professor Campbell, May т, 1896) ; 3 and 5, near Stan- 
semicircular, blackish-purple, nitent scales, which do not exceed 
the margin ; principal divisions 2-9 mm. long, at first simple and 
obovate, finally linear or linear-obcüneate and 1-3 times dichoto- 
mous ; terminal lobes 1—1.5 mm. wide, obcuneate-oblong or ellip- 
