56 MARCHANTIACEAE 
Mill Valley (Howe), St. Helena (Jepson), Jackson (Hansen), 
Pasadena (McClatchie), San Bernardino (Parish), Santa Monica 
(Hasse) ; also at San Diego by an unknown collector and at Witch 
Creek, (San Diego Co. ?) (R. D. Alderson). 
The original specimens were collected by Dr. Palmer on 
Guadalupe Island, off the coast of Lower California. Portions 
of what appear to be the original plants are found in herb. Un- 
derwood and herb. Columbia University. 
Asterella fragrans (Schleich.) Trevis.—to which A. Palmeri is 
probably most nearly allied—has been found in New Mexico, 
Idaho and Alaska, and is likely to occur in California. This differs 
from Asterella Palmeri іп the conspicuous white scales projecting 
beyond the margin of the thallus, in the presence of an involucre 
of narrow whitish paleae at the base of the peduncle, in the yellow, 
more broadly margined spores, etc. The spores of Asterella Palmeri 
show a tendency to cohere in large masses until very late in the 
Process of ripening—a character which seems also to be exhibited 
by A. fragrans. 
PLATE 99. 
1-15. Asterella Talmeri. 
I. Plant, natural size. 
2. Thallus, showing peduncle and position of androecium, У 3. 
3. Transverse section of thallus through androecium, 2 
4. Median longitudinal section of thallus 
of peduncle, 23. 
5 and 6. Fully developed 9 receptacles, dry, 
X 4. 
7-10. Series of cross-sections of peduncle fom near apex to base, Х 41. 
II. Capsule ій dehiscence, жола. 
E 
X 23. 
, passing through androecium and base 
I5. Section of mature spore, X 225. 
Figs. 1, 2, 6, 12 and 14 drawn from Guadalupe Island material (legit Palmer) ; 
3-5, 7-10 and 15, St. Helena (Jepson); 11 and 14, Jackson, Amador Co. ( Hansen). 
5. ASTERELLA GRACILIS (Web. f) Underw. Bot. Gaz. 20: 61. 
1895. 
Marchantia gracilis Web. f. Hist. Musc. Hep. Prod. 105. 
1815. 
Marchantia pilosa Wahl. Fl. Lapp. 399. 1812. Not М. pilosa 
Horn. Fl. Dan. 8: 7. pl. 1426. 1810. 
