ON CAL1FORNIAN MOSSES. 3 



and more slender, pale green, marked, even before full maturity, with eight regular deep 

 striae. The teeth are simple, shorter, irregular, variable in size. On the ground, San 

 Francisco. 



6. WEISIA cirrhata HeJw. 



Appears abundant in California, and variable. A fine form sent with the normal one, 

 is more compactly ca?spitose, with shorter leaves, longer teeth of the peristome often split 

 at the summit and marked with stronger articulations. Grows on the stumps of Sequoia 

 viridis, Redwood, &c., around San Francisco. 



7. DICRANUM varium Brid. 



On perpendicular sandstone rocks, constantly watered by a spring near the Bay of San 

 Francisco. The watering has elongated the stems, rendering them more slender, and 

 giving to this form a peculiar look, different from its common appearance. Nevertheless, 

 anatomical examination does not show any modification of specific characters. 



8. CERATODON purpureus Brid. 



The common form and also a variety with white pedicels (var. xanthopus Sul. & 

 Lcsq. in Musci exsic. Amer. 1st edit.) On roots and stumps of Sequoia viridis, &c. 



9. FISSIDENS limbatus Sul. Hot. of the Ex. 



Wet, shady ground near San Francisco. May. Appears common. 



10. TRICHOSTOMUM tophaccum Brid. 



Wet rocks, Fort Point. This species shows on its peristome all the varieties indicated 

 in the Bryologia Europea. Even a smaller form with shorter capsules and a dark green 

 color of foliage, has the peristomal teeth generally short, obtuse, united in one in their 

 whole length, presenting thus a peristome of sixteen short, somewhat irregular divisions, 

 like that of some Seligerice. But even on the same specimens, this variety disappears, 

 and some capsules have the divided teeth of a true T r i c h o s t o m u m. 



11. TRICHOSTOMUM flexipes Bryol. Eur. 



Trichostomum crassinerve Hampe, in pamphlet, 1860. Mr. Hampe has made of this a 

 new species, separated by the smaller size of the plants, narrower leaves, thicker evanes- 

 cent nerves, smaller areolation, and white peristomal teeth. Comparing Bolander's and 

 Hampc's specimens with original specimens from Sardinia, I find them perfectly identical. 

 The areolation is the same, the color of the peristome, as well as the size of the plant and 

 of the leaves are variable. This year, Mr. Bolander sent from Marin County specimens 

 twice as large as the European ones, all the leaves having an evanescent nerve. In this 

 large variety, the pedicel of the capsule is perfectly straight, as it is often also in the com- 

 mon form. Grows on shady ground near Oakland, &c. ; appears common in California. 



