CLASTODERMA.J STEMONITACEiE. 133 



the ultimate branches attached singly or two or three together 

 to the membranous plates of the sporangium -wall. Spores pale 

 lilac, smooth, 7to lO/idiam.— Christ. Vidensk. Torh., ]Sro.4(1882); 

 Bidr. K. Norg., Sop. iii. (1892), p. 7. Orthotricliia microcepliala 

 Wing., I.C.; Mass., Mon.-,^). 109. 



Plate L., B. — a. sporangia, x 20 ; J. apex o£ stein, capillitium, and 

 spores, X 280 ; c. part of capillitium from another sporangium, x 280 

 (United States) ; d. capillitium with expanded membranous plates, x 280 

 (Norway) ; e. spore, x 600 ; /. sporangium, x 20 (Norway). 



This species was discovered by Prof. Blytt in 1879, near Ohristiania, 

 growing on dead Polyporus. In the United States it has been re- 

 peatedly found, and described by Mr. Wingate as Orthotrichia micro- 

 cephala. In these gatherings the threads anastomose more freely than 

 in the Norwegian specimen, and the disc-shaped fragments of the 

 sporangium-wall are usually less pronounced. In some sporangia, 

 however, they agree essentially with the type kindly submitted for 

 examination by Prof. Blytt, and it cannot be doubted that they are 

 the same species. 



Hah. On dead wood.— Norway (Ohristiania Herb.) ; Borneo 

 (L:B.M.100) ; Philadelphia (B. M. 874) ; Ohio (L:B.M.100). 



ALLIED GENERA NOT MET WITH IN THE QUOTED COLLECTIONS. 



RACIBORSKIA Berl., in Sacc. Syll., vii., p. 40a (1888). Spor- 

 angia naked, globose, stipitate. Stem produced into a columella 

 one-third or half the height of the sporangium, bearing at its apex 

 short, slender, secondary columellse, which branch again in a 

 similar manner, the ultimate branches combining to form a net- 

 work without free ends, — BostaJmsMa Racib., in Rozpr. Mat. 

 Przyr. Akad. Krak., xii., p. 77 (1884). 



1. R. elegans Berl., I.e. Sporangia naked, globose, 0-5 mm. 

 broad. Stalks erect, 1 to 2 mm. high, subulate, furrowed, black. 

 Columella cylindrical, 8 to 10 /* wide. CapUUtium blackish- 

 violet, the branches becoming gradually more slender outwards, 

 the ultimate branchlets furnished with scattered spines. Spores 

 dull violet, 9 to 10 /A diam. — Eostajmskia elegans Eacib., I.e., p. 78. 



Hob. Botanical Gardens, Cracow. 



This description applies to Gomatrioha ohtusata, in which the 

 columella frequently branches in a dichotomous manner. 



ECHIHOSTELIUM de Bary, in Rost., Yersuch, p. 7 (1873). 

 Sporangia stalked, minute, naked, without columella. Capillitium 

 arising from the apex of the stalk, its branches forming a 

 network. 



1. E. minutum de Bary, in Eost., Mon., p. 215, figs. 53, 54, 

 58, 68. Sporangia scattered, stipitate, globose, 37 to 57 /a, diam., 

 naked, whitish. Stalk 0'28 to 0'46 mm. high, brownish below, 

 pale above. Capillitium of curved branching threads, with acute 

 free branches. Spores entirely colourless, 6'7 to 8'3 /x. diam. 



Hob. Frank£ort-on-Maine. 



