4 
274 The Botanical Gazette. [July, 
R. ALBIDA Sulliv. is known only by two plants. The type 
was collected by Wright in Texas in 1845 and is in the Sul- 
livant collection. I have received a single plant from Lang- 
lois, collected in Louisiana. Both plants are lacking in fruit. 
The plant is allied to R. glauca in its vegetative characters . 
but its spores are a desideratum in order to understand its | 
affinities. 
R. LAMELLOSA Raddi as represented in Austin’s Hepatice ; 
Bor.-Am. no. 140 has spores quite unlike those figured in . 
Lindenberg (Monog. Ricc. ¢.30), lacking the hyaline margin. 
t may prove to be an undescribed species, but until Raddi’s 
type, if in existence, can be seen it will be desirable to let it . 
rest in its present position. The spores in this specimen are ) 
very characteristic, being 84-94 in diameter, clearly and 
regularly but not strongly reticulated over the rounded sur- 
face. Austin’s plants were from Closter, N. J.; the same 
plant has been sent from Mobile, Ala., by Dr. Mohr. . 
R. ARVENSIS, var. HIRTA Aust. is apparently a very dis- 
tinct species differing widely from R. arvensis in the densely 
ciliate margins of the thallus and especially in the larger 
spores (92-108) which are nearly black and consequently al- 
most opaque and very indistinctly reticulate. It was issued 
by Austin (Hep. Bor.-Am. no. 142) but the specimens In the 
set in my herbarium are sterile; Austin has described the 
spores in his MSS. now in my possession, which is important 
since they were omitted in the original description. Speci: 
mens sent me in 1884 by Parish from San Bernardino, 
material collected by Bolander, and especially the fine et 
terial furnished by Dr. Campbell for our exsiccate Sent 
Amer. no. 138) have enabled me to separate and diate 
this very distinct and elegant species, which will take t 
name Riccia hirta Aust. (1869, as synonym.) ‘hed and 
R. CALIFORNICA Aust. was very imperfectly describe aes 
the type is inaccessible if in existence. I have referre ey 
this species some sterile fragments from the California Aca 
emy of Science, and fragmentary fertile specimens ©” 
near Berkeley by M. A. Howe, which closely agre : 
brief description. The light brown spores with faint re a 
tions with very small areola (12-14 measuring the ante 
surface of the spore) are quite characteristic of these pee 
mens. More material is needed to trace the full chara¢ a? 
the species and the same is true of its congeners R. tem 
