PDF file (text) - Cryptogamic Botany Company

Recommendations

Info

182 THE MARINE ALGÆ OF NEW ENGLAND. Gloucester. The fronds form rose-colored crusts of considerable extent, and are so closely adherent that they can scarcely be removed. The tetrasporic conceptacles are large, but very much flattened. LITHOTHAMNION, Phil. (From λιθος [lithos], a stone, and θ µνιον [sic] [thamnion], a bush.) Fronds calcareous, thick, at first horizontally expanded, but afterwards producing erect knobs or coralloid branches; otherwise as in Melobesia. A genus comprising probably not more than twenty or twenty-five good species, most of which are tropical. The larger and more solid forms inhabit deep water. In Lithothamnion the cortical portion is markedly developed, and it not rarely happens that new lobes are produced which overlap the older ones and form an imperforate layer over the older conceptacles, which are thus occluded before the spores are ripe. In such cases sections show conceptacles which are apparently buried in the central part of the frond. L. POLYMORPHUM, (L.) Aresch. (Millepora polymorpha, L.; Sp. Alg.—Millepora (Nullipora) informis, Lamarck.—Melobesia polymorpha, Harvey‚ Phyc. Brit., Pl. 345.) Fronds thick and stony, purplish, becoming whitish, forming incrustations of indefinite extent and occasionally rising in thick clumsy lobes, punctate throughout with the very numerous, small, immersed conceptacles; antherozoids spherical, with an appendage at one end (Bornet); tetraspores two-parted; cystocarps? On rocks and stones in deep pools and below low-water mark. Common from Nahant northward. Not known with certainty south of Cape Cod, but very common northward, where it forms stony, purplish incrustations on rocks. As usually seen, it adheres closely to the rocks, covering patches of indefinite extent, and would be mistaken for a species of Melobesia. It is so hard and adherent that it is mistaken by persons on the shore for a part of the rock itself. Although the determination of the present species admits scarcely a doubt, the form usually found with us is smoother and less lobed than European specimens of the same species. In the description given above the tetraspores are said to be two-parted. This is true of all the American specimens examined, but it may be that what we have seen were immature spores, which, when ripe, are four-parted. L. FASCICULATUM, (Lamarck) Aresch. (Millepora fasciculata, Lamarck.—Melobesia fasciculata, Harv., Phyc. Brit., Pl. 74.) Fronds purple, stony, attached, afterwards becoming free, very irregular in outline, densely branching, branches fastigiate, subcylindrical, apices generally depressed; tetrasporic conceptacles densely covering the branches, flattened, hemispherical; tetraspores two-parted. On stones or in free globose tufts at low-water mark and in deep water. Eastport, Maine; Europe.
REPORT OF THE COMMISSIONER OF FISH AND FISHERIES. 183 Rather common at Eastport, where it is often dredged. It is also found at low-water mark during the spring tides, especially on Clark’s Ledge. Small forms of what may be the same species are occasionally washed ashore after storms as far south as Nahant. The species is at once distinguished from all our other forms by the very numerous, short, stout, cylindrical branches. The conceptacles are external and contain two-parted spores, which may possibly be later four-parted, although in the specimens we have examined they seemed to be quite mature. The conceptacles, as far as could be made out, had no distinct orifice, and were very much flattened externally. To follow Stilophora, page 89: ADDENDA. ARTHROCLADIA, Duby. Fronds olive-brown, filiform, branching, composed of a large central filament formed of cylindrical cells and a series of polygonal cortical cells, which become smaller towards the surface; plurilocular sporangia moniliform, borne on branching monosiphonous filaments which form tufts on the branches. A small genus, consisting of a single species, which has been divided by Kützing into three, characterized by the tufts of monosiphonous filaments which bear the sporangia, and which are arranged in whorls, giving the fronds a nodose appearance. Harvey and Agardh place the genus in the Sporochnaceæ, while Le Jolis places it in a special suborder of Phæosporeæ. A. VILLOSA, Doby. [sic] (Sporochnus villosus, Ag., Sp. — Elaionema villosum, Berk.) Fronds six inches to three feet long, delicately filiform, with a percurrent axis and usually opposite, widely spreading, 1-2 oppositely pinnate branches; fructiferous filaments byssoid, in dense penicillate tufts which form irregular whorls; plurilocular sporangia moniliform, composed of numerous cells, about 15-20 in a row, generally secund on the branches of fructiferous filament; unilocular sporangia? Washed ashore at Falmouth Heights, Mass., Mr. F. T. Collins; Cape Fear. A rare species, only known on the New England coast from the specimens collected by Mr. Collins, which were rather smaller than European specimens. The species bears a more or less considerable resemblance to Desmarestia viridis, but the penicillate tufts are more regularly arranged in whorls, and bear the sporangia, which is not the case in the genus Desmarestia. To follow Lyngbya, page 34: SYMPLOCA, Kütz. Filaments as in Lyngbya, but adhering to one another in fascicles. Scarcely distinct from Lyngbya except in the existence of a mass of jelly, by means of which the filaments adhere to one another in meshes. In habit the species of the
Page 1 and 2:
I.-THE MARINE ALGÆ OF NEW ENGLAND.
Page 3 and 4:
REPORT OF THE COMMISSIONER OF FISH
Page 5 and 6:
Page 7 and 8:
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132: REPORT OF THE COMMISSIONER OF FISH
Page 181: REPORT OF THE COMMISSIONER OF FISH
show all

PDF file (text) - Cryptogamic Botany Company

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?