nearly entire with age, strongly revolute, giving it a truncate appearance. 



Spores bright yellow-green. 

 Coast as far north as Alaska. 



On trunks and branches of trees on the Pacific 



7. PoRELLA RoELLii Stephani. Fig. 7. 

 Green or yellow-brown, glossy; procumbent, 

 flaccid, caespitose, subdichotomous, the prim- 

 ary branches simply and distantly pinnate- 

 dorsal lobes desnsely imbricate, appressed, 

 ovate, apex narrowed, subtruncate ; ventral 

 lobes ovate or linguiform, much narrowed 

 toward the apex, about half as wide as the 

 underleaves, length | the width of the dorsal, 

 margins plane, spurred at the base, especi- 

 ally on the outer angle; underleaves close 

 together, ovate - linguiform, obtuse and 

 rounded at the apex; perianth large, obovate, 

 truncate, with dentate mouth. 



Under shelving rocks and on cliffs, along 

 the Pacific Coast. The species is closely re- 

 lated to the European Porella laevigata, and 

 sterile plants may be confused unless care be taken. 



8. Porella Bolanderi (Austin.) Pear- 

 son. Fig. 8. {Madotheca Bolanderi Aust.) 

 Dark green, dull; stems subsimple or some- 

 what fascicujately branched; dorsal lobes 



g ^^.^ densely imbricate, ovate to oblong with ob- 



Fig. 7. Porella Roellii 

 Stephanii. 



A, Underside of leaves. 



B, Ventral lobe. 



C, Lobule, 



Fig. 



Porella Bolanderi 



. tuse apex, strongly deflexed or rolled when 

 dried, with margin of inflated cells, upper 



(Austin.) Pearson. 

 B, Part of leaf, showing ven- edge repand or sometimes caudate-dentate, 



tral lobe. 

 C, Underleaf. 



the base reaching beyond the stem ; the ven- 

 tral lobes and underleaves often so close as to 

 conceal the stem ; ventral lobes ovate-lanceolate, usually rather acute, 

 long decurrent, nearly separate, length |— f the width of the dorsal lobe, 

 caudate-lacinulate on inner side at base ; underleaves ovate-lingulate, wider 

 than stem, long decurrent, wings caudate on either side near the base, un- 

 dulate-repand above; perianth broadly ovate, narrowed at the mouth, which 

 is ciliate and subtruncate. 



On stones, shelving rocks, and bark of trees. California. 



Sayre High School, Sayre, Pa. 



OFFERINGS. — [To chapter members only — for postage.] 

 Mrs. J. D. Lowe, Noroton, Conn. Raphidostegiuin recurvans — Amblysteg- 



ium variinn — Cliiitaciuvi Ainericanuni Kindbergii. 

 Miss H. B. Bailey, 830 Amsterdam Ave., New York City. Hypnum impon- 



ens — Bryiim biinum — Grimmia apocarpa. 

 Mr, Ed, B. Chamberlain, Cumberland Center, Maine. Treniatodon ambiguus 



— Hedwigia albicans. 

 Mrs. C. W. Harris, 125 St. Mark's Ave., Brooklyn, N. Y. Physcia obscura 



— Physcia piilveritlenta. 



