Tin: MAHiNi: alg/E of new England. 57 



13ULB0C0LE0X, Priii-sli. 



(rrom pu?.,h^, a, bulb, ami Ko?.eov, a .shratli.; 



rilaments bram'hiii<j, creeping', composed of two kiinls t)! cells, (nic 

 in-odiiciiii; miincroiis z()osi)ores, the other l)nll)()iis at the base but drawn 

 out into a iiibi', tVoin the oi)en extremity i»t' whicli ja'ojectsa Ion;; Ih'xible 

 hair. 



Thi> <::i'nMs, consist iu^j of a single species, was first descriluMl by PriMixslieiin in tin' 

 AbhantUungen der konij^l. Akademie der Wissenscbalten, IJeilin, iHjvi, who foinuled 

 il uiHiu a small ali^a parasitic in the fronds of lAntln-sid and otlur J'liao»2>on'a; at 

 Helgoland. 



The gi'nus resembles Colcovhate, a fresh-water genus, in tiio structure oi' the hairs, 

 but in liulbocoleon no reproductive bodies, except zoospores produced in the ordinary 

 cells, have as yet been discovered. It is not impossible that oospores may at some 

 time be found, and it will then be necessary to remove the genus from the present 

 oitler. 



B. PILIFERU3I, Pringsheim, 1. c., p. 8, PI. I. 

 Characters same as those of the genus. 



Parasitic in the fronds of Lcathcsia tuhcriformis and Chordaria divari- 

 cata. Summer. 

 Xewi)ort, li. I.; Wood's lloll, Gloucester, Mass.; Europe. 



This minute species is found creeping among the cortical cells of Lcathcsia and 

 f liordaria, generally in company with a Strcblonema. It forms dark spots on the 

 fronds, and, on microscopic exauiination, the hyaline hairs arc seen i)rojecting above 

 the surface. The species is studied with ditlicnlty when parasitic on Lcathcsia, owing 

 to the density of the cortical part of the frond, but is more easily examined when it 

 grows on Chordaria. It was found by Pringsheim on Chorda filitin, Chordaria JlagcUi- 

 formis, and Mcsorjloia rcrmicularis, as well as on Lcathcsia. It probably will be found 

 on several other Phceosporcce of our coast, where it appears to bo common. 



rhe following genus described by Reiusch, including a species of which we have 

 ..'•t been able to examine specimens, should be included in the account of the Chloro- 

 sporc(v of our coast : 



Acitoi»L-V.STE, new g(Mius of Chronhpidca\ 



Plants microscopic, marine, forming densely aggregated tufts attached to stones and 

 bhells; threads erect, subsimple, branching from the base, arising from luocumbent, 

 densely interlaced threads; conceptacles in the upper i)art of the branches nearly 

 spherical, at lirst unicellular, afterwards producing 20-:jr) spherical zoospores; after 

 the discharge of zoospores elliptical, with a wi<h' mouth; development of the branches 

 and growth of the threads as in Chroolepus and Cladophora. 



Acroblaste, r\m:c. Contents of cells linely granular, distinctly circumscribed; color 

 blightly glaucous green; cell-wall thick, sublamellated, twice as long as broad. 



Height of plant, .S'JfKG"'™. 



Diameter of lilaments, .OOoO-^^O""". 



IMameter of conceptacles, .<»n;;*-iyG"'"'. 



Diameter of zoospores, .<)0*i2""". 



I/ab. — Attached to shells and stones, Buzzard's Bay, Mass. 



Koiusch., in Botauische Zeitung, l^7\J, No. 2:J, I'l. 3 a. 



