140 A Monograph of the Myjcogastres. 



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the periphery the branches become many times thicker, and 

 form a small-meshed regular network, furnished with numerous 

 stout, acute, free tips ; the free tips are simple, or once or twice 

 furcate ; the entire capillitium is protruded elastically during 

 dehiscence; colume] la absent; spores globose. 



Distinguished from Arcyria, its nearest ally, by the very 

 numerous free, pointed, simple or branched spines springing 

 from the tubes of the stout peripheral portion of the capillitium, 

 the meshes of which are much more uniform in size and shape 

 than in Arcyria. The present genus agrees with Ophiothcca 

 in the presence of numerous free arms on the capillitium, but 

 in the last-named genus the free ends are not attenuated at 

 the point, but usually inflated, and furthermore the tubes of 

 the capillitium are of equal thickness throughout, and not of 

 two distinct types as in Heterotrichia. 



Heterotrichia Gabriellae, Mass. (n. sp.) (figs. 205 207). 



Sporangia densely crowded, becoming scattered towards the 

 margin of the cluster, cylindric-ovate, wall thin, smooth, even, 

 at first red, becoming yellowish-brown at maturity, upper por- 

 tion disappearing, leaving a small calyculus ; stem much shorter 

 than sporangium, thin, filled with large cells; mass of capil- 

 litium and spores yellowish-brown ; threads of central portion 

 of capillitium about 1'5 /x thick, with slightly raised rings or 

 short bands partly encircling the tube, almost colourless, threads 

 of peripheral portion bright-yellow, 5 6 /u thick, forming an 

 even network, free arms of equal thickness to tubes of network, 

 40 GO fj. long ; every part densely and uniformly covered with 

 warts or short bands, a few scattered elliptical swellings are 

 present on the tubes and spines ; spores globose, smooth, 7 8 /ix 

 diameter. 



On wood. South Carolina. 



(Type in Herb.,' Kew.) 



Sent to Dr. Cooke by the late H. W. Ravenal, accompanied 

 by the following note: "Arcyria Gabriellae, n. sp. Primary 

 state red, becoming fuscous, closely congregated, elongated, 



