. Dansk botanisk arkiv. Plants; Plants -- Denmark. 48 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. sporangia also occur often rather numerous especially in the upper part of the plant. The diameter of the sporangia is about 11— lA/jL, the length about 18//. This species has been found upon Liagora pinnata. St. Croix: White Bay. 16. Acrochætium Avrainvilleæ nov. spec. Thallus cæspitosus usque ad 1 mm altus. Pars basahs ex interiori parte plectenchymatis hospitis emergens, ex filis brevibus in filis hospitis externe repentibus composita. Tola planta a basi ad apicem sensim attenuata. Fila erecta, a basi
. Dansk botanisk arkiv. Plants; Plants -- Denmark. 48 Dansk Botanisk Arkiv, Bd. 3. Nr. 1. sporangia also occur often rather numerous especially in the upper part of the plant. The diameter of the sporangia is about 11— lA/jL, the length about 18//. This species has been found upon Liagora pinnata. St. Croix: White Bay. 16. Acrochætium Avrainvilleæ nov. spec. Thallus cæspitosus usque ad 1 mm altus. Pars basahs ex interiori parte plectenchymatis hospitis emergens, ex filis brevibus in filis hospitis externe repentibus composita. Tola planta a basi ad apicem sensim attenuata. Fila erecta, a basi simplicia, in superiori parte ramosa, ramis multi- laterahbus, rectis, plus minus ramosis instructa. Gellulæ cylindricæ, in parte basali ca. 9 fi latæ 33// longæ, ad apicem versus ca. 4/« latæ 50// longæ, chro- matophorum parietale, pyrenoide late- rali instructum continentes. Sporangia sessilia aut interdum pedicellata, sparsa aut pauca seriata, oblonga, 11/j. lata, 22 jm longa. This plant was found upon an old specimen of Avrainvillea nigricans. The basal part of it was fixed to a filament of the host plant lying rather deep in the cortical plectenchyma (Fig. 47 a); on account of its very loose texture the Acrochætium has no difficulty in growing out through it, and as I have only met with two specimens of it in all I dare not deny the pos- sibility that the Acrochætium might be found quite epiphytic upon the external filaments of the host. The basal part consists of short, creeping filaments attached to the surface of the filaments of the host plant; they consist of proportionally short and thick-walled cells. From the cells in the middle of the basal filaments the erect ones are given off (one or more). At their base the erect filaments are unbranched (Fig. 48);. Fig. 47. Acrochætium Avrain- villeæ nov. spec, a, filaments of Avrainvillea nigricans with the basal part of the Acro- chætium. b, base of the same plant more magnified. (a, about 40:1; b, 700:1)..
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Keywords: ., bookcentury1900, bookcollectio, bookdecade1910, booksubjectplants
