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Text Appearing After Image:Fig. 31. A and B, Nostoc Linckia Bornet;A, nat. size; B, small portion of thallus,x 340. C, N. co-rule tint Lyngbye, nat. size. Fig. 32. A-D, Anabæna inæqualis (Kütz.) Born. & Flah. E-G, Cylindrospermum stagnale (Kütz.) Born. & Flah. H, Nodularia sphærocarpa Born & Flah. (All × 480.) h, heterocyst; sp, resting-spore. 44 Myxophycese Reproduction takes place by hormogones and by resting-spores. The latter arevariable in shape, and may be solitary or seriate. In Cylindrospermum the spore arisesfrom the cell next the terminal heterocyst (fig. 32 E—G). About half the species ofNostoc and Cylindrospermum occur in subaerial habitats, but all the other members ofthe family are aquatic. Species of Nodularia are mostly brackish-water forms. Fam. Scytonemaceae. The Algae of this family are distinguished by their peculiartype of branching. As a rule there is only one trichome within a strong tubular sheathof regular thickness. The false branches arise either singly or in pai
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الرجاء إضافة المزيد من وسوم حقوق الطبع والنشر لهذه الصورة إذا أمكن تحديد معلومات أكثر تحديدا عن حالة حقوق الطبع والنشر، انظركومنز:ترخيص لمزيد من المعلومات.
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هذا العمل يقع في النَّطاق العامّ في بلد المنشأ وفي البلدان الأخرى والمناطق التي تمتدُّ فيها مدة حقوق التَّأليف والنشر لتغطي زمن حياة المُؤلِّف و 100 سنةً بعد وفاته أو أقل من ذلك.
يقع هذ العمل في النَّطاق العامِّ في الولايات المُتحدة الأمريكيَّة لأنَّه نُشِرَ (أو سُجِّل لدى مكتب الولايات المُتحدة لحقوق التَّأليف والنَّشر) قبل ١ يناير ١٩٢٩.