CRYPTOMITRIUM 45 
I. CRYPTOMITRIUM TENERUM (Hook.) Aust. |. c. Stephani, Bot. 
Gaz. 17:68. 1862. Bull Herb. Boiss. 9: 222. 1899. 
Howe, Erythea, 5 : 87. pk 3. 1897. 
Marchantia tenera Hook.; Kunth, Syn. Pl. 1: 46. 1822. 
Duvalia tenera Gottsche; С. L. & N. Syn. Hep. 554. 1846. 
Peduncle 15-30 mm. x .3—.5 mm.: spores 35—50 и; elaters 300- 
450 и long, 7-11 м in greatest width. 
On moist shaded banks. Fruit Vale, Alameda Co. (Miss Edith 
S. Byxbee, Howe); Navarro, Mendocino Co. ( fide Miss Byxbee); 
Menlo Park (Blasdale); Folsom (Mrs. Brandegee); Jackson, Ama- 
dor Co. (Hansen); San Bernardino (Parish, no. 2221); Pasadena 
(McClatchie). Also collected in California by Parry, Bigelow, 
Bolander, and Torrey (fide Austin). 
The original plant of Hooker was collected near Ario [State 
of Michoacan (2) | Mexico, by Humboldt. A portion of this, bear- 
ing the legend “no. 236, Marchantia tenera, п. sp.," Legit “ Hum- 
boldt," has been sent to Professor Underwood through the kind- 
ness of Dr. W. T. Thiselton-Dyer, the Director of the Royal 
Botanic Gardens at Kew, and is deposited in the herbarium of 
Columbia University. This fragment, rather unfortunately, bears 
only very young capsules, so we have been unable to compare 
spores and elaters, but it seems to agree essentially with the Сан- 
ifornian plant in structure of thallus and peduncle, form of С re- 
ceptacle, position of antheridia, etc. The peduncles are, however, 
much shorter, being only 3 or 4 mm. high, but this may be due, 
in part, to the immaturity of the receptacle ; they are, moreover, 
only about half as thick as in the Californian specimens, which 
may, perhaps, be partly accounted for by the possibility that after 
so many years’ drying they may not fully regain their natural size 
on soaking out. 
Duvalia brevipedunculata Mont. from Chili (legit Gay) is thought 
by authors to be the same species. The Californian plant is, how- 
ever, in need of further comparison with those of Mexico and Chili. 
PLATES 93 AND 94. 
CRYPTOMITRIUM TENERUM. 
1-4. Principal segments of thallus, natural size ; fig. 2, with a fully developed 9 
receptacle and peduncle. 
